California
Super Star Member
- Joined
- Jan 22, 2004
- Messages
- 14,946
- Location
- An hour north of San Francisco
- Tractor
- Yanmar YM240 Yanmar YM186D
Ha.spray them then cut them after they are dead
Our orchard was sprayed to keep down weeds like in this stock photo, for a hundred years.

After we went organic (apples were unsalable if not organic) lots of stuff lurking under the surface began to emerge. After the fourth year I took the backhoe out, and pulled out a lot of stuff like my photo below that years of spray + annual disking hadn't killed. This root is 'scrub oak' (like holly). Invasive Himalayan Blackberry (the other debris pile) often has a root node the size of a softball then multiple 3 ft deep roots. Both survive anything you do on the surface because of energy stored in the roots.
'Brute force gardening' (backhoe removal) is the only thing I've found to eradicate stuff this durable.
I found another photo I posted here 11 years ago. This isn't the biggest blackberry root ball I've seen, but my only photo. Keychain for scale. Like the scrub oak root above, the taproot went down 3 feet to the wet layer above hardpan.