Plum Pollination. 10.27.15

Among the more challenging aspects of growing Asian and Hybrid plums is pollination.  Some varieties self pollinate, many require a different plum variety.    Different websites have different information.  In different areas, rules that apply in one area might also not apply in another, due to differences in temperature or bloom time.  Sometimes, you just plant a tree or trees and hope for the best.

The nursery sites are not always accurate, or don't necessarily give the wanted information.  The source of the information is not usually given.

Raintree.com - my source for Shiro and Hollywood.  These 2 seem to pollinate each other.  Shiro is described as partially self pollinating, and Hollywood is described as self pollinating.  They bear well in my Vancouver yard, without other visible plum trees in the neighborhood.

Hybrids can indicate any species with another species, but usually refers to Asian species hybridized with native American species.  Asian species give larger size and more meaty flesh, American species add to the flavors and give much better cold compatibility.  Many of the hybrids are about 100 years old, so are nonpantented, and do not have industry or university sponsors or advocates.

University of Minnesota Ag Experiment Station workers did a detailed project regarding hybrid plum pollination  in 1950.   Among their tables, abstracted below.  I summarized only the varieties that I have seen for sale as trees or scion, various sources.

Prunus simonii

From Table 3.   Hybrid and native plums rated as good pollinizers.
Kaga.  P. americana.  12 recipient varieties tested.  Early bloom.
Toka.  P. american X P. simonii.  22 recipients tested.  Early bloom.
South Dakota.  P. americana or P. americana hybrid.  27 recipients tested.  Medium late bloom


From Table 4.  Hybrid and native plums rated as fair pollinizers.
Ember.   P. salicina hybrid X P. americana.  24 recipient varieties tested.  Bloom season, mid.
Hanska.    P. americana X P. simonii.  17 recipients tested.  Early.
Superior.  P. salicina X (P. americana X P. simonii). 18 recipients tested.  Early / mid.
Shiro.  P. salicina hybrid.  1 recipient tested.




From Table 5.  Pollinizers tested and rated as poor.

Prunus salicina "Shiro"

La Crescent.
Pembina.
Underwood,
Waneta.
Tecumsah.

Other comments from the  1950 U Minn paper -

The study began in 1932, and extended for a number of years.

It was noted that native plums had good pollen viability, while hybrids had generally poor pollen viability.   Some had 50% with aborted pollen grains.  Many of the hybrids produced pollen with empty or aborted pollen grains.  Toka was shown to have good viability but a poor pollinizer.  However, in the tables Toka is listed as a fair pollinizer.

Lack of fruit production may be defective pollen, low viability of pollen, or pollen incompatibility.

Among hybrids, more of those with female American plum parent, were good pollinizers. P. simonii may also contribute something to hybrids, in terms of being good pollinizers.

The authors also note that many of the hybrids resemble mainly their female parent.  They go on to say that  this may be due to apomixis, reproduction without sexual fertilization.

So you might think you have a hybrid, based on pollination, when reality the variety is selfed.

Rutland Plumcot.

From Table 8.  Compatibility. Recipient named first, pollen sources follow.  P=poor, F=fair, G=good.

Ember.  Hanska (G), Kaga (F), Superior (G), Toka (G), S. Dakota (G), not self.
Hanska.  Ember (G), Superior (F), Toka (G), not self
La Crescent.  Ember (P), Hanska (P), S. Dakota (G), Toka (G), self not mentioned
S. Dakota.  Ember (F), Hanska (G), Superior (F), Toka (G), not self
Superior.  Ember (P), Hanska (G), Kaga (G), Superior (G), Toka (G), does pollinize self.
Toka.  Kaga (G), Superior (G), not self.
Underwood.  Ember (P), Hanska (F), Kaga (G), Superior (F), Toka (G), self not mentioned.
Waneta.  Ember (G), Hanska (G), Kaga (G), Superior (F), Toka (G), self not mentioned.

This seems to disagree with other reports of Toka pollinizing self.

Finally, there is also an issue of bloom season.

Prunus cerasifera

From Table 8.  Varieties of plums suggested...

Early bloom season - Superior, Toka.
Mid bloom season - Ember, Underwood.
Mid to late - South Dakota.

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Info from TheFarNorthGarden.com website:
"P. salicina hybrids were developed by crossing native wild plums with plum varieties from California that were not hardy, producing hardy trees with good quality fruit. These include 'Pembina' (sometimes called 'Prairie', 'Acme' or 'Elite'), 'Patterson Pride', 'Brookred', 'Geddes' and 'Perfection' (sometimes known as 'Superb'). These hybrids will only produce fruit if they are pollinated by a wild plum, and they do not provide pollination for any type of plum, including each other. This may explain why some growers have poor fruit production with these trees."

Another lesson - plums of the same variety can have different names.

From "Plums on the Prairies" - by Rick Sawatzky, University of Saskatchewan
On terminology - " Pollinators , usually insects, are vectors of pollen movement. Pollinizers are plants which provide the appropriate pollen for other plants"

On Pollinizing - " George F. Chipman who edited the Prairie Gardener for many years and who wrote about plum pollination in 1934. He summarized a study done by Prof. W. H. Alderman at the University of Minnesota by saying, “...very few hybrid plums would accept pollen freely from other hybrids, but they would all accept pollen from native plums”. 

A precaution comes to mind -  not from a specific source, but from my observation - most of these studies and comments regard plums grown in the Midwest, and usually the North Midwest at that.  There, the climate is not friendly to most Asian plums, which is why they are interbred with American species.  Therefore, the pollen from Asian plum varieties might not be tested on the hybrids.  Both Toka and La Crescent have Shiro as a parent, so Shiro might pollinize those varieties.


From LMtreefarm -
Brookgold - Asian plum
Brookred- Asian plum
Greenville  - Asian (Burbank) by P. nigra
Patterson's Pride - P. nigra X Asian plum, 1960
La Crescent - Howard Yellow apricot X Shiro Asian plum 1923
Pembina - Native Canadian plum X Asian plum "Red June"
South Dakota - pollinator for hybrid plums, a selection of Prunus americana.  1949
Tecumseh - Shiro X "Surprise" -
Toka - Native plum X Chinese plumcot P. simonii.  1911.

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Toka plum

HardyFruitTrees states La Crescent is "Also known as 'Crescent', 'Golden La Crescent' and 'Golden Minnesota'. La Crescent is a cross between the 'Shiro' plum (Prunus simonii x Prunus salicina x Prunus cerasifera x Prunus munsoniana) and 'Howard Yellow' plum ( Prunus americana). It was introduced in 1923 by the University of Minnesota Fruit Breeding Farm"

The source has some nice things to say about La Crescent - "sweet and juicy...golden-orange color...flesh is yellow like an apricot... melting and not fibrous... freestone... taste has an hint of apricot. and they note that it is a poor bearer and must be pollinized by and American or Canadian plum.

Of Pemina, they state - "hybrid between a Japanese plum (Prunus salicina) and a Canadian plum (Prunus nigra)... self-sterile... must be pollinated by a wild plum tree, or a pure American plum tree (Prunus americana), or a pure Canadian plum (Prunus nigra)....introduced in 1923 by Niels Ebbesen Hansen from the South Dakota Experimental Station in Brookings"

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Based on all of this information -

-Of readily available varieties to pollinize Hybrid plums, Toka seems to be the best candidate.
-South Dakota seems equally good as a pollinizer, but is harder to find.
-It's not clear to me that Asian plums have been tested as pollinizers for hybrid plums.  It's worth adding them into the mix in this area.
-If a pure American or Canadian plum can be found, those are considered among the best pollinizers for hybrid plums.
-Probably, the more types in the mix, the better the chances for a good crop.  If there is not room for multiple plum trees, or ability to are for multiple plum trees, multigraft is an option.

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Images are public domain via U.S. Department of Agriculture Pomological Watercolor Collection. Rare and Special Collections, National Agricultural Library, Beltsville, MD 20705.  " The majority of the paintings were created between 1894 and 1916."

Home Orchard Plans for 2016. 10.27.15

Raining today. 

Thinking about next year.  Replace some trees that died, and plan for a couple that might, and replace a couple of non-
performers.

Esopus Spitzenburg Apple

Deaths:  
North Star Cherry.  2 years old.  Apparently voles.  There is no bark on the roots.
Big Asian Plum.  From the size and rings, at least 10 years old.  Apparently mining insects.  There were tunnels under the bark.

Non-performers.
Honeycrisp on M27.  Karmijn on M27.  I think this rootstock is way to limiting, and the trees can't grow worth squat.  These are planted near each other, and can be replaced by one larger tree.  I can use the Honeycrisp for scion.
Indian Blood Peach.  Maybe 8 years, only 4 foot tall, no fruit set, ever.

Opportunities.
I have 3 Hollywood Plum trees in containers, and one in-ground, started 2 years ago.  The container trees are larger due to TLC.
I have 1 Ember Plum, 8 foot tall whip, grafted onto Hollywood rootstock early 2015. 
I have potential scion sources, existing Toka plum, Hanska grafted onto on unidentified plum tree, Honeycrisp and Liberty apples on M27.
I have an unidentified plum grown as accidental cutting from the tree that died.  It's a good plum, large, meaty dark purple flesh.

Concerns.
Toka Plum.  Bark on trunk is highly damaged.  I don't know, by what.  I want to preserve the variety.  Use scion from existing tree,  on Hollywood Plum rootstock.

Montmorency Cherry

Plan.  Subject to change at any whim.

1.  Make a new Toka Plum, grafting from existing tree onto Hollywood Plum rootstock. 

2.   Move the unidentified plum cutting to a better location.  Maybe were the North Star Cherry died.

3.  Remove Indian Free Peach.  Replace with Surefire Cherry, new tree.

4.  Remove small Hollywood plum.  That one needs more TLC, transfer to container.  Replace with Ember on Hollywood rootstock.  I can  do that this fall.

5.  Make a Hanska Plum on Hollywood rootstock.  Grow in container to give it TLC until it is a good size.

6.  Buy scion for another plum variety - Superior?  Graft onto the 3rd Hollywood rootstock and give it TLC.

7.  Replace the M27 trees with Nadia Cherry / Plum hybrid.

8.  Try whip / tongue grafting to top work remaining branches of Almaden Duke cherry with Ranier and Lapin sweet cherries.  The T-budding didn't work so well.  A couple might have taken.  This tree has 2 rootstock suckers.  Maybe I should graft onto those, and cut down the original tree.

9.  I have the first apple that I grafted, but mixed the labels.  It is either Sutton's Best or Esopus Spitzenberg.  Either way, I can give that a try.  There is a second graft on that one, again mixed up.  Either Liberty or Jonagold.  I might graft onto that tree, a 3rd and 4th variety.  I can use the Honeycrisp, and might use scion from Fedco for another.

Hanska Plum

10.  I have rootstock, semidwarf but unsure which.  I can graft onto that and keep it in container for TLC.  Options, Pristine, which is early and very good, or something new from Fedco. 

11.  I think I will buy Sweet 16 from Burnt Ridge.   If so, it will need a location. 

12.  Oregon Curl Free Peach might also not make it.  The Peach Leaf Curl didn't kill it.  Canker might.  If so, I think this will be a good spot for a plum.  If  Toka doesn't make it, that will also be a spot for one of the new grafts getting TLC.

That seems like a lot.  I could easily use up the entire 2 acres, but I can't take care of that many.  This year I was not able to water enough, which might have contributed to a couple of deaths and some of the non-thriving trees.  Definitely Montmorency cherry and Saijo persimmon were stressed, but they look like they will make it.  The multigraft apples on the other side of the road, had very little watering but lived.  They are still young.  One is Chehalis + Akane + Jonagold + Summerred + Fuji, the other is the one described about with 2 semi-unknowns.

There is also a Jonagold on M27 in a flower border that contains 3 young columnar trees.  I think that will come out, and a new columnar that I grafted last year will replace it.

All images on this page are public domain, via U.S. Department of Agriculture Pomological Watercolor Collection. Rare and Special Collections, National Agricultural Library, Beltsville, MD 20705.  They either illustrate varieties I have, or might obtain, or I used as general illustration for that species.  Illustrations are late 19th and early  20th centuries.

Fall in the Orchard. 11.8.14

North Side of Orchard.  11.8.14

Wild Plum Seedling.  2 years old.  11.7.14

Buddleia Windbreak West of Orchard.  11.8.14

Fig Row, South of House.  11.8.14

 Some views of mini orchard spread around the yard.  This is end of the 3rd summer here at Battleground, so many of the trees have had 2 full years to acclimate and grow.

Pawpaws were planted the first summer.  Never having grown them, and read about difficult to get started and slow to grow, I'm pleased they have done this well.  The smallest is Rebecca's Gold, about one foot tall.  NC-1 is the largest, about 4 foot tall.  Sunflower, about 3 foot tall.  I'm also pleased about the persimmons.  Nikita's Gift was so tiny I wondered if it would grow.  Now, sturdy and looking promising for future years, although  only about 4 foot tall.  Saijo is about 8 foot.  I did give  them - and the paw paws, organic nitrogen this Spring.

Peaches - Oregon Curl Free about 9 foot tall.  Charlotte about 8 foot tall.  Indian Free about 3 foot tall.  Q-1-8 in it's first year, grew rapidly, 5 foot tall.  The only one of the 3 older trees to have bad leaf curl was Charlotte.  That was also the only one to have peaches - only 2 - this is only the 2nd year old for these.

 Wild Plums, the largest seedling is about 8 foot tall.  This is 3rd year from seed, the first being in container.   There are 3, only one in a prime location for sun and with protection.  Deer eat up to about 4 feet, but the top looks very good.

Other plums, Stanley didn't bear but is very large now, mature looking tree.  Has spurs with promise for flowers.  Satsuma died.  Replaced with cutting-grown Hollywood, 1 foot tall 1st year from cutting.  Toka was best tasting, 3 plums. 7 foot tall.  Methley, no plums, growth now 5 foot tall.  NOIDs already on property, the smallest / deer mangled fully recovered and above the usual deer browsing height; the largest had only about 4 plums.  Now both with multiple bud grafts of other varieties. 

Cherries, lots of deer browsing.  Very discouraging.  The sweet cherries and tart cherries need better protection.  Sweet cherries did establish well, now about 5 foot tall.  Central leads are good, branches browsed to within the narrow cages I installed on these.   Montmorency did very well when I got the deer fence in, 8 foot tall and lush.   I can buy more fencing if I use the truck to commute this week.  North Star and Almaden Duke unprotected browsed nearly to death, we'll see what happens next year.  Both have some bud grafts that are looking tenuous, we'll see.

Apples, this is first year for most.  Wondering if minidwarfs are a good idea.  The dwarfs - JonaRed - shipped from Starks, excellent growth, and multi-graft disease resistant, Rubinette, Pristine, and Queen Cox, shipped from Raintree, almost as good.  The columnar apples, planted at about 18 inches tall their first year, now about 3 foot tall, Golden Sentinel had one apple - very good, Scarlet Sentinel had none.  They are in cages.

Illinois Everbearing Mulberry and NOID Forsythia. 11.8.14

Figs, South of house, recovered from frost kill.  Sal's was not frost killed, now 4 foot.  Tiger, Carini, Smith all grew multi-trunks to 2 or 3 foot.  Petite Aubique, 18 inches, but sturdy.  I'm in process of installing gnaw-screens as leaves fall.  When colder, plan to add inverted trash can protectors for the young ones, and chicken wire or bird net to deter deer and rabbits, for Sal's.  Plan next year- replace the NOID with Lattarula from container, in Spring.  Maybe add one more to row, Dominick.   If any die back again maybe replace with Dominic instead of adding one more.

Buddleia hedge grew to 8 foot tall, for those in 2nd year - Blueberry and Peach Cobbler varieties.  They weren't all that attractive, but the windbreak will be useful.  That side is source of wind.  Honeycomb, in 2st year, grew about the same as the others did last year.  Anticipate pruning all back, so they can grow bushier and not over-tall.

Illinois Everbearing Mulberry, not in the 5 X 5 grid but nearby.   Now 8 foot tall.  Had some nice mulberries this year.  No dear browsing.  Most branches probably too tall.  It may be hard to install bird netting next year due to height, but I should try. 

Toka Plum-Apricot Hybrid. 8.31.14

Toka Plum/Apricot.  8.31.14

Toka Plum/Apricot 8.31.14

Toka Plum/Apricot  8.31.14

This is the 3rd fruit from the Toka Plum/Apricot.  I planted this tree 2 years ago, a potted tree on close-out from Home Depot.  This is the 1st year it has borne any fruit - not bad, nice to have a taste - and there were 3 fruits.

It took some time to identify the origin of Toka.  It is listed most places as a plum, sometimes described as "bubblegum plum" due to the complex, very sweet flavor.  I wouldn't call it "bubblegum", but the flavor is delightful.

According to

Growing Fruit in the Upper Midwest (Google eBook)

by Don Gordon, copyright 1991, this plum was developed in 1911 at the University of South Dakota.   Toka is the Sioux Indian word for "Adversity".  I imagine that is because of the tree's hardiness.  Other plums with the same lineage are Kanga and Hanska.  The book describes this fruit as a cross of 'native plum' and 'Chinese apricot' - which makes it a distant relative of both European and Asian plums, in a category all its own.  Toka, on the other hand, was designed with more adverse climates in mind, has a much longer period of experience in the US, and is way beyond patent so can be used in grafting.

 

I happened on this fruit completely by accident.  I suppose I should refer to it as a plum, but based on the flavor and the lineage, American plum/Chinese apricot hybrid would be a better description.

 

Wow, it's good. 

 

Toka is considered an excellent pollenizer for Euro and Asian plums.  I wonder, then, if hybridization would result in other interesting, hardy fruit.

New Trees progress report.

Cherry "Almaden Duke"

Jujube "Li"

 Here is the progress report for new trees planted 2012 - 2013.  Most, but not all, are fruit trees.  They are young.  Not all are pictured here.  They are in no particular order.

Duke Cherry "Almaden Duke".  Now 6 ft tall.  Growth this year, 6".  Transplant from Vancouver yard last fall.

Ginkgo seedling from Illinois.  My dad's collected seed, tree is the smallest of the 3 I grew.  6ft tall, growth 0 inches.  There were tufts of new growth from each node, but no stem extension.  Leaves remain green so far.

Madrone.  New planting this fall.  6 ft tall.

Sweet Cherry "Vandelay".  New bare root from Raintree, started late this winter, before my surgery.  3'8" of which 2" is new.

Sweet Cherry Sweetheart.  As for Vandelay.  3'10" of which  1'2" is new.  Bloomed after planting, no fruit.

"Greenspire" Linden, South side of yard near house.  6'6" of which 1'6" is new. 

 Jujube "Li".  Planted as container plant last fall.  about 1 ft tall, of which 6" is new.

Pawpaw "NC-1".  All pawpaws were planted summer 2012.  2'7" of which 7" is new.

Pawpaw "NC-1"

Pawpaw "Rebecca's gold".  This tree was eaten by an animal, leaving only about 3".  It grew to 1ft 7" tall, 3 stems.

Pie Cherry "North Star".  Planted as container tree from Lowes, late Spring.  This tree is 5'4".  Growth occurred before I planted it, about 1 ft was new.  This tree had cherries when I bought it.

Pie Cherry "Montmorency".  6'3".  I moved this from Vancouver last summer.  18" of the growth was this year.  This tree bore cherries this year.

Wild Plums - grown from seeds summer / fall 2012.  Tallest is 4'3", next is 3', and smallest is 2'.

Peach "Indian Blood".    Now 4' tall, of which 1ft 4 inches is new.

Persimmon "Seijo".  Now 4'10", of which 15"  is new.  This was bare root planted this year, from Raintree.  The growth was nice, but there is a wound on the north side, narrow, extending much of the old stem.  The wound is about a mm wide.  I don't know what that bodes for next year.

Pawpaw "Rebecca's Gold"

 Persimmin "Nikita's Gift".  2'6" of which 2" is new.  Small but survived the first year.  Persimmons are considered difficult to start, but making it through the first year is encouraging. 

Peach "Charlotte"

Peach "Oregon Curl-Free"

 Peach "Charlotte".   6ft total, of which 2'2" is new.  Fast starting tree.  Moved from Vancouver last summer, started from bare root Spring 2012 as container tree.

Peach seedling and Grape "Price"

Peach "Oregon Curl Free".  Total 4'5" of which 3'7" is new.  Same issues as for "Charlotte"

Pawpaw "Sunflower"

Pie Cherry "Surefire"

Apple "Red Sentinel"  2'4" tall and "Golden Sentinel" 2'4" tall.  Minimal added height this year.  These were planted last summer.  The rootstock may be super-dwarfing. 

Linden "Greenspire" in front yard.  This was the first of the Lindens.  9"  tall of which 1" is new. 

Peach Seedling 8" - unknown parentage, suspect genetic dwarf.  Volunteer in vegetable bed, which was treated with compost.  If it develops leaf curl, I don't plan to keep it  The "Price" grape 8" was a cutting from my vines at home.

American Linden "Redmond"  5 ft tall, 4" is new.  This was container tree planted last winter.

Pear "Rescue"  4 ft tall, 9" is new, and pear "Orca, 4 ft, 9" is new.  Both bare root trees from Raintree, planted late winter 2013.

Apple "Spitzenberg" 3" of new growth on 6" of rootstock.  This was new graft, grown from new graft early Spring and given TLC with fertigation; Apple "Sutton's Beauty" 1'6" of new growth on 6" rootstock, same situation.

Chinese Haw "Red Sun", 4'8" of which 1" is new.   Bare root from "One Green World" nursery planted last fall. 

Plum "Stanley"

Sweet Cherry "Sweetheart"

Plum "Toka"

Mulberry "Illinois Everbearing", 6'4" tall, of which 11'1" is new this year.  Moved from Vancouver yard last fall.

Plum "Stanley" 7'6" of which about 2' is new.  Moved from Vancouver last year.

Plum "Toka" 5'10" tall, of which 1'4" is new and plum "Satsuma" 5'6" of which 3" is new, both bought as potted trees last summer on sale at Home Depot.

The Sourwood I planted in Sept, is 7'8" tall.

I've started applying a layer of compost around each tree.  Ran out, more expected with another truckload of compost this week.