Linnea, my neighbor has Rose of Sharon and it does reseeds, so you will find seedlings frequently. Not sure about cultivar though might be less spreading?
Would love to encourage everyone to spread the word, on media and otherwise. It is people who make this garden swap great success we have had year after year.
In additional to water iris and hollyhock I have
tomatoes, cherry and large ones, mostly indeterminate. Sweet peppers, few zucchini- Italian varieties like striata d'italia, I find them to have pleasant nutty taste, eggplant.
Ornithogalum nutans Star of Bethlehem- happily spreads where allowed and can be a nuisance for formal gardens. It is beautiful foliage and lovely spring flower though so good for problem areas where not many things grow.
Foxglove excelsior tiny seedlings. It could be nicotiana seedlings though but I think it is reseeding foxglove.
Geranium/ perennial/ from Lily Lowell with dark spring flowers- gentle reseeder.
Some no name hostas.
Campanula trachelium- lovely stately plant and does NOT spread by rhizomes only by seed so if you deadhead you will have same lone clump for years. If properly deadheaded will bloom looong time. I have blue and white but will not know which seedlings are which. Pretty hard to transplant as it has deep root.
Campanula punctata- does spread by rhizomes but I do love their showy flowers, would not be without it.
from ephemeral early spring bulbs
chionodoxa blue
winter aconite
scilla sibirica
puschkinia scilliodes
Valerian- another stately plant with tiny white flowers and dissected foliage, reseeds but gently.
Impatiens glandulifera- which is Himalayan impatiens, reseeds, sometimes too much, very tall 3-6 feet. Bees love it. I have mix now so all colors from white to dark maroon will result. Seedlings are easy to remove though.
Euphorbia cyparassias- one of my favs but does spread. I removed it too much last year so this year as not as showy as previous ones. I do love wild gardens so most of my plants will reseed or spread.
Dwarf variegated yellow striped bamboo Pleioblastus viridistriatus- well it is a bamboo so only pot. Not good for soil as it spreads, should be not hardy for our zone but with our warm winters ...
Miscanthus Cabaret- tall variegated grass, I like it but had to make space for dwarf cherry tree.
Tiny seedlings of columbine, Elliot, Blue star and Harlequin
