They'll get bigger but they don't have invasive roots. Seed like mad though
They do seed and I have had a few come up but they are not invasive .
I have a forest of them but they're not hard to remove. Problem is I let them all grow on to see if there are any good ones in there. You do get some but there is a tendency to seed back to the dirty pinks.
I'd allow quite a bit of room between plants as the leaves flop/sprawl as the season continues.
They will self-seed. I leave some, but move a lot as they are usually too close to the parent. I have some pots of babies from my Ashwood plants doing nicely. The seedlings flower themselves after 4-5yrs, but yes, do tend to be the mucky pink/burgundy unless you are very lucky! J.
Well worth the space. I love them. I'm watching them building up for it now. Just need to get all those mankey leaves off first
I think that's a good idea Verdun. If only because most years I'd be walking on dry soil not the squelch I've got now. It's very exciting at this time. Always something out there. Bulbs appearing, so what if they slow up when the real winter comes. catkins on hazel, alder. garryea. The little cyclamen coum, arum italicum, flowering shrubs. absolutely wonderful.