IMHO — TERRIFIC force was applied when the tree fell on them and the shrubs probably suffered internal structural damage. It’s not likely that they will be able to straighten out on their own, but they CAN be repaired like broken bones, especially right now when the rapid spring (cell) growths may supply the impetus needed.
IMPORTANT TO REMEMBER —
(1) don’t try to straighten them more than they can manage. You may need to gradually coax them into the straightness you desire.
(2) don’t try to work on them when they are frozen. If overnight temps were in the 20’s, wait until it’s up in the 40’s or more during daytime.
(3) any splintery or jagged breaks or cuts will invite infection, so have sharp tools ready to make clean cuts or shave/whittle smooth, and it’s probably best to sterilize the tools between plants — bucket of water with bleach (not sure of amounts) is not often recommended... I use 91% rubbing alcohol in a spray bottle.
I think you should try to straighten them with splint-like supports and/or guy lines (you can get ground stakes for this purpose). For this kind of task, I use old leaky garden hoses cut up long enough and string a braided or woven nylon rope through, then use the section padded with the hose around limbs and trunks. You can tie the guy lines onto the splints rather than the limbs and this will spread out the force of the pull to the multiple connection points of the splint (use wide soft fabric like cut up old T-shirts or even plastic grocery bags. Avoid using tape because the adhesive may damage the bark)
- After straightening them as much as they will take without breaking, re-tie the splints and tighten the guy lines once a week until they are back to the way you want.
- look them over carefully and if they would benefit more from pruning, this is a good time to do that for many plants... but let us know what kind of plants they are — some shouldn’t be cut in spring, and some need to wait until a little later.
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