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Helenium 'Moerheim Beauty' is the only one I've grown, although at the Wisley trials some years ago the variety 'Rubinzwerg' caught my eye and I thought it best of the lot. I'm still waiting to grow that one...
I didn't find my Helenium's invasive at all... reliably perennial though...
Veronicastrums I'm not familiar with from growing, only reading about... quite tall plants I think...?
I've got a few Moorheim Beauty plants too - so far behaving themselves beautifully, and definitely not a thug. I love the colours - sort of marmalade/burnt sugar. Don't give them away Verdun - you'll love them
Brum I just use the 'canes put in with string round 'em' method,or fine branches from prunings and where possible other planting to support them, but I don't grow a lot of tall perennials usually.
Verd- is is because of your soil conditions that Heleniums are a bit invasive? Not grown them myself that I can recall but I think you have very different soil/climate conditions from me.
Both plants will be perfect in a priarie style border with grasses, sedums rudbeckia, salvias. achillea, cow parsley etc. and ideal in a cottage style border or garden
I use shrub prunings and garden twine to hold mine up.
Heleniums aren't invasive, so you will be fine.
Staking is the thing that gives me the most problem in gardening. Whatever I seem to do the stakes are allways to prominent and some plants end up being trussed up like a joint of meat.
Luckily Veronicastrum dont need staking, although I do find my taller heleniums do.
Close planting helps for support, twigs and sticks from prunings, wire meshes when young - looks awful for a few weeks but soon disappear. Some things lying abut loook lovely anyway.
I love veronicastrums even though they don't always survive my winters and have a fairly short flowering period. I always buy a few new ones each spring and then live in hope.
I'm just getting going on heleniums because it's hard to find the more interesting and newer varieties with better colour but I understand they do very well with the Chelsea chop which encourages shorter, bushier, sturdier stems. It remains to be seen whether the ones I bought last year have survived but I'll be googling about for seeds to grow my own for next year.