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I have a dahlia bed, how can we help?
You can plant them closer than that -I do-that distance is if you want exhibition blooms-for cutting in the garden it is not so vital -just give them room to grow.
Have you started them into growth or are they just dried tubers?
What part of the country are you?
90cm! mine are a lot closer than that. I try to avoid the tubers touching as that can cause problems.
I started my tubers indoors and have now planted a lot of them out as they are going strong.
I planted mine out 2 weeks ago-you can plant them quite deep so if there is an unexpected late frost they will resprout-I would suggest that once it stops raining you get them in.
It will depend on the look you are going for, I believe she grows to cut so needs to walk between them. If you have gone for the very large varieties you may need to allow 50 cm but 90cm sounds a lot.
Make sure you stake as you go as you do not want to put a stake into a tuber at a later date, you will need stakes.
I dont do cms so had too look it up
You will be ok at around 2 ft or so apart- perhaps even closer-it is not vital and as they grow they will support each other but you will also need to use canes.
Garden canes and soft string are fine.
When you have them in flower post some pictures and let us know how you got on-guard against slugs/snails especially on warm wet evenings