Kieft Seed Scheduling Tool

Rudbeckia Goldsturm

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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 transplant week

Grow plugs under short days from 2 to 10 true leaf stage. Transplant into natural long days of 15 hours or more; or provide day extension lighting to 16 hours or night interruption lighting.

Late-Summer/Fall

Week color desired

Quart
(1 ppp)

Gallon
(1 ppp)

Sow week

Plug transplant week

Grow plugs under short days from 2 to 10 true leaf stage. Transplant into natural long days of 15 hours or more.

Notes/Pitfall Management
Not reliably and uniformly first year flowering, even with short day treated plugs. Best overwintered.

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