By Sjw
gloucestershire,
United Kingdom 
I have grown delphiniums from seed they are doing really well, now into their 3rd year, I have decided to reorganise my flower bed. I know the autumn would be the best time to move, but will it mean they will be smaller next year, do they take easily to being disturbed. I also have one plant that was fine last year, but this year its growth is stunted, I have moved this one and it is still not growing although looks very healthy it has not put on any height any know reason. Thanks
3 Jun, 2010
Answers
Thanks Bertie, I did not know you could divide delphiniums like that, so you just split them like hardy geraniums dividing the clumps and replanting.
3 Jun, 2010
It's best done every three years, in early spring.
4 Jun, 2010
Personally I would divide and replant herbaceous perennials, including delphiniums, in the early spring. Sometimes doing it in the autumn before a poor winter can set them back. In general I find they do much better after dividing, especially if they have got congested. Do you work a nice lot of compost into the new planting hole as delphiniums like good soil?
3 Jun, 2010