I don't think they grow again from the tops. Don't let him/her loose again.
Bamboo is best reduced by completely removing some stems and leaving the rest.
If the plant is too tall, it's the wrong plant for the situation.
It's a hypericum. Maybe Hypericum androsaemum at that height. How big were the flowers, this one has smaller flowers than some of the garden species which are more showy. Never noticed the smell on any of them
I'm a great believer in sowing fresh seed. I have germination already from seeds I've sowed this month. Fresh seed germinates very quickly in pots outside in the shade.
on the first pic the top looks dead but the base is alive. I'd cut the dead top off and give the live bits room to grow
I think they'll grow away when you plant them out, they won't have changed genetically. If you soil is diggable and you're prepared to keep them watered I don't see why not now. You'll need to tease the roots out if they're pot bound and make sure the surrounding soil is moist. A good watering on planting but lots now and again is better than little and often after that.
te compost would fall out through chicken wire, as well as the water
the children are not allowed to play out because of a few insects? Don't pass on your fear of insects to the kids, there's a world of wildlife out there, get them interested in it.
We always used to grow it with no problem before the press got hold of it. I have been affected by the sap, it was a bit sore for a day or two but not worth a newspaper artcle. It's a most unlikely plant for anyone to eat. but I wouldn't leave a child alone in a garden until after the stage of putting everything in the mouth, there will be far nastier things out there that the press haven't picked up on yet.
an amazing sight in the meadow earlier. Rising ants in the sunlight against a dark background. Looked like a bonfire.
much too tall for what?