All your plants should be in 5 inch / 125 mm pots by the middle of May. Stop plants when 5 to 6 inches, 125 mm 150 mm, tall or after 4 -5 pairs of leaves depending on the number of main flowering stems you wish to have. Plants, whether seedlings or cuttings, should now be in your cold house or frame hardening off; do protect from frost!, if real chill threatens a fleece covering will do a great job.
Take any late cuttings should you need to produce more plants. These will grow on but not begin flowering until, probably, mid-August but will consequently go on longer if there are no frosts in late October / early November. Keep your hygiene programme going.
In the south and south-west start planting out dahlia plants when the weather is suitable and there seems to be no risk of a late frost. As things are at present with the weather I anticipate beginning the planting out around the 3rd weekend in May.
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