Which option is best for alliums?

I have 72 allium bulbs that I planned to plant in my back border. Problem is a lot needs doing to prepare the area, and I won't be able to get to it until spring.
The following options are available:
- I can either plant them now and mark the area, ensuring it isn't disturbed when the other plants are moved next year. Not ideal, because I will have spots I won't be able to plant in.
- I could plant as many as possible in pots and transplant them later into the border when it is ready in spring. If so, will 2 gallon pots be sufficient? Any tips on how to give them their best chance? I presume if I sink the pots into the ground over winter they will do better than above-it worked for my blueberries last year.
- I suppose the third option would be to grow them in a holding bed, and transplant them in the spring when the bed is ready.
These are the varieties I am trying to grow.


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They are reliably hardy down to -15C or so as long as they are not wet or frozen thru so either keep the pots in a sheltered space that doesn't get colder than that or plunge them in the ground till you're ready to plant them out permanently. A raised holding bed would be perfect for that.
Here's some general allium care advice from the RHS. Just folllow the links. You can also check Purple Sensation on the same site - https://www.rhs.org.uk/plants/popular/allium/growing-guide
https://www.rhs.org.uk/Plants/57088/i-Allium-hollandicum-i-Purple-Sensation/Details
https://www.rhs.org.uk/Plants/58292/i-Allium-i-Gladiator/Details
It's very easy to then plant them out, and you can separate them quite readily if you want them in a drift, rather than planting them as a complete 'pot' into a space.
A good layer of snow, when it arrives, won't harm them