Plants You Should Not Divide
Generally, the best time to divide perennials is early spring and early fall but there are some plants that just don't do well divided at any time. I compiled a list of plants you should not divide so you don't waste your time because chances are you will be dissapointed in the end.
This is not a complete list by any means so you can be sure, there are many more.
Baby's breath - Gypsophila
Butterfly Weed - Asclepias
Candytuft - Iberis sempervirens
Columbines - Aquilegia
Christmas Roses - Helleborus
False Indigo - Baptisia
Gas Plant - Dictamnus albus
Globe Thistle - Echinops ritro
Windflower - (Japanese) anemones
Lavender cotton Santolina chamaecyparrus
Lavender - Lavandula angustifolia - I've heard some folks have no problem with dividing these and others say, "No, don't do it!"
Lupine - Lupinus
Oriental poppies - Papaver orientale --If you want try, do so when they die back in the mid to late summer.
Peony- Paeonia--It is very difficult to have success dividing.
Rosemary - Rosmarinus officinalis
Southernwood - Artemesia abrotanum
Spurges - Euphorbias
I'll keep adding to this as I continue learn, have sucesses and failures.
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