ornamental allium multiplying
Can anyone tell me which ornamental alliums do not multiply invasively? I have A. christophii and A. Mt. Everest which are very tame - a few offsets some years and slowly multiplying. I was told that A. Moly will multiply just like chives and would be everywhere - I just hate how much work that is to yank out - or dig one at a time.
Here are the ones I'm interested in from the Van Engelen catalog:
Allium azureum - blue, June
Allium cowanii - white, May blooming
Allium flavum - Small Yellow Onion June/July
Allium ostrowskianum, Syn: A. oreophilum - pink May/June
Allium pulchellum, Syn: A. carinatum, red-violet June/July
Allium triquetrum white May to July
Allium schubertii - purple May/June
Allium sphaerocephalon - purple Syn: The Drumstick Allium. "Great naturalizer with dense, crimson-purple, egg-shaped flowers". July - does naturalize mean a larger clump or takes over the world with seed?
I have a significant deer population and am working on adding alliums to my beds instead of lilies. Van Englelen has a good selection and their 2005 catalog will be posted in May - trying to plan ahead. I'm going to cross-post to the perennials forum. Thanks!