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Data is gathered from our Elburn, Ill., trials (Zone 5a) for a North American audience. Warm-climate growers: expect 1-2 weeks earlier finishing. Cool-climate growers: expect 1 week slower. Dates based on standard 288 plug size.
Spring/Summer
Week color desired
Quart
(1 ppp)
Gallon
(1 ppp)
Sow week
Plug ready week
Plug transplant week
Long day lighting required. Day extension to 16 hours or night interruption. Overwintered or short day treated plugs not necessary.
Late-Summer/Fall
Week color desired
Quart
(1 ppp)
Gallon
(1 ppp)
Sow week
Plug ready week
Plug transplant week
Transplanting after week 25 will greatly delay flowering and may not flower first season after week 28 transplant without night interruption lighting. Overwintered or short day treated plugs not necessary.
Notes/Pitfall Management
Prefers slightly higher pH around 6.0-6.2. Use B9/Cycocel as necessary. Sumagic will make plants look abnormal. New leaves tend to curl/pucker upon flower initiation. Low humidity and high Calcium will reduce the severity. Plants will grow out of this and flowers will cover symptomatic leaves.
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