Alliums are always better in the ground , they are not difficult to grow either as long as they are not planted in waterlogged soil and have part sun / full sun they are usually reliable plants. They are one of my favourite plants I have about 250 ish ( not including Spharocephalon ) and 11 variety's must add more , envious of the allium stand at Chelsea
Well I watched the Allium feature again and paid attention this time. Unfortunately she didn’t say which types needed digging up and storing, digging up and splitting or which ones are fine left in the ground... Had a look on her website but no info there either...
I have had Purple Sensation not appearing at all, Purpureum disappearing after one year and the little Sphaerocephalon resisting all efforts to get rid of it!.
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
I've had alliums for a few years now and have always left them in the ground. I've never heard of lifting, then drying them off like tulips. The 'Christophii' are just coming out and look normal size to me. I've got far too many because I like to keep the seedheads on, so have had to dig some up and chucked them. My guess is the very dry weather we had last year made the bulbs shrink so the flowers are smaller this year. As we have clay soil, perhaps mine did better as more moisture over winter?
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May be they are better planted in the pots (and then placed in the garden when in bloom).
I have had Purple Sensation not appearing at all, Purpureum disappearing after one year and the little Sphaerocephalon resisting all efforts to get rid of it!.