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I had 4 sissoos removed in April and now have them coming up all over, front and back. I spray with round up but they don't seem to die. It's too hot out to go digging right now. Any other suggestions?
Do you have a good nursery or gardening center around (not Home Depot or similar, but the real thing.) They might have some suggestions. Otherwise, you may need to talk to an arborist.
This is exactly what happens with a crepe myrtle, and why I consider them to be invasive. I worked for 3 years on eradicating a couple of trees, tried everything listed above, and was only partially successful. One area, I covered with thick black plastic for a year and a half, and when I took it off, it all just sprung back to life.
Wait, you must be joking . You had trouble removing a crape myrtle here in Phoenix? This climate and especially the alkaline soil isn't really to their liking, so the notion that it's "invasive" here makes me laugh. If you get one to thrive here (Phoenix), you are a fortunate gardener. They're beautiful, small trees.
PS- Pardon me. I just realized this is not the Phoenix gardening forum. Perhaps crape myrtles can become invasive in favorable climates like the deep south, but certainly not here in Phoenix.
The crepe myrtles were in central Texas. If you were in my shoes, you would not be laughing. These were 40 foot trees with extensive root systems. My yard was so seriously overplanted that there was no sun for anything. Some had to be removed. But they will resprout from maybe 1/2 inch of root material left in the soil. I lived there for 5 years, and had areas of my yard that were useless because of the constant resprouting that nothing could kill. And these sprouts produced no flowers, just 2 foot high, useless vegetation, not even attractive. They would come up in my lawn, in pathways, etc. In my experience, a crepe myrtle, once established, can never be removed.
Cut down a Sissou a few years ago. Pulled up as many roots that were near the surface. Ground down the root ball about 10 inches below surface, and then drilled the heck out of the stump and filled the holes with Round-Up. Had some shoots the first year, but continued drilling if roots were fairly shallow and Round-Up applications. The process worked for me here in Arizona.
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. You had trouble removing a crape myrtle here in Phoenix? This climate and especially the alkaline soil isn't really to their liking, so the notion that it's "invasive" here makes me laugh. If you get one to thrive here (Phoenix), you are a fortunate gardener. They're beautiful, small trees.
