Clearing Himalayan Blackberries, Again. 1.3.2020

 I've been cleaning up the Himalayan blackberries in the border at the North edge of the property.  This area was impenetrable when we bought the place in 2012.  I cleared a big portion of the blackberries in 2015-2017, planted a row of Leyland Cypress in an attempt to have some privacy, out-compete the brambles, and hold the soil, given a bit of a bank on the North side.  I also planted rhododendrons on the near side of some.  And mostly, grass seed.  Unfortunately, it was not possible for me to keep the rhodies cleared of blackberry.  The cypress grew well but some not fast or thick enough, so there was a growing amount of blackberries to clear again.

Some photos from 2015. These brambles were impenetrable back then, around ten feet tall.  There were some fallen cascara trees mixed with them.

This is 2015, part way through clearing the brambles.  Back then I was using a pruning shears.  Now I'm using a hedge trimmer, which seems to go faster but is also harder work.

 After clearing the first area.  I planted Leyland cypress trees at the northern side, between cleared ground and the falling cascara trees.  That was in winter 2015-2016.

Now, five years later, this batch of cypress have filled in, and there aren't a lot of blackberry brambles in this area.  Almost, but not quite, none.  The caged tree is a ginkgo that is failing to thrive, and probably should be moved out.  Some more of the cascara trees have fallen.  I think they are at their size limit and will continue to fall down.

 

This was the other area, east of the first area.  There were a lot of fallen cascara trees mixed with the brambles.  So those had to be cut off.  After this cleanup, I planted the Leyland cypress trees as in the first group, but they were much smaller trees.  On the near side, I planted the rhodies and some perennials.  That was a mistake - too hard to keep clean.  This week, the rhodies went elsewhere, and I cleaned it up again.  Not nearly as bad as the first time around, but I don't want to have to do it again.  This photo shows the area in 2015.  The entire visible ground area was blackberry thicket.

This is after cleaning the same area up yesterday.  This wasn't nearly as bad as the first time around, but still more than I want to be doing.

Another view after cleanup.  Once I get rid of those piles of blackberry vines, I'll broadcast grass seed in the cleaned up area.  The piles of vines compost fairly fast, and just sort of disappear, but I'll most them to where they are not in the way.  In the future, this area will just be mowed, which will prevent further encroachment.  In addition, the cypress trees are large enough, I think they will mostly out-compete the blackberries in the future.

Blackberry clearing and remediation project. 5.10.16

Before clearing blackberries.  5.10.16

Here is the status of my Himalayan blackberry removal project.   Moving into summer, I doubt I will do much work on removing more, too hot and sunny.   I started last winter, not intending to go far with this.  

However, after seeing the results, my intent is to clear all of the brambles from this part of our property.  Originally, blackberry thickets covered about 1/4 acre of this 1 acre parcel.  I have cleared, maybe 2/3 of the brambles now.

Before and after removing blackberries.  5.10.16

After removing an area of blackberries.  5.10.16

 I wear leather gloves, and use bypass pruning shears to shop approximately 2 feet at a time.  Often I grab multiple stems at a time and cut through them.  I make piles of the cut brambles, like little haystacks in the cleared area.

Gradually, the land is cleared.  Cut blackberry stems are like dry sponge.   The seem to degrade fairly fast, easier than tree stems.  I made some very large piles in an out of the way location, so they will compost themselves.  The compost will be added to garden beds.  Composting may take a year.

Six months after removing blackberries.  5.10.16

For the area that I cleared last winter, I scattered grass seed.  The grass established during late winter and spring.  Mowing the grass is also killing off the blackberry stems that re-grow, and will eventually kill it off entirely.  No chemicals.  Some sprouts are so vigorous, they are as soft as asparagus spears, and I just wear gloves and snap those off.  It will take about 2 solid days of work, to clear the area in the photo, labeled "Before Removal".

The photos are separate parts of the cleared and uncleared areas.  I did not think to take actual before photos.  The cleared area was actually worse than what I have not done yet - brambles were 25 feet into the trees, and the depth of the thicket was greater.

The hawthorne trees in this area are unstable, weak and falling.  They  look nice when cleaned up a bit, but I don't think they will last very long.  We've planted cyprus to protect the soil, which a bit beyond this area slopes into a ravine and creek, and for privacy.  Cyprus grow rapidly and thick, so the intent is to shade out any remaining blackberries - this photo faces south, with the forested area north of the cyprus trees.  They are a hybrid cypress which does not make seeds so is not invasive.

There may be some cool mornings this summer when I can clear more.  I'll hold up seeding more grass until then, when rains will help it establish.  Meanwhile, ripe blackberries will be much easier to harvest adjacent to sections that I have already cleared.