Schedule Crop - Coreopsis Double the Sun

Coreopsis Double the Sun

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.

Notes/Pitfall Management
If necessary plants can be cut back to re-flower fully. B9/Cycocel is effective at managing growth. Plug growth is easier to manage if grown under short days

Week color desired

Sow week

Plug transplant week

Early Spring

Quart
(1 ppp)

Gallon
(3 ppp)

Spring/Summer

Quart
(1 ppp)

Gallon
(3 ppp)

Late-Summer/Fall

Quart
(1 ppp)

Gallon
(3 ppp)

Coreopsis Double the Sun

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Germination
Seed Form:	PRM
PlugSize:	288
Seeds/Cell:	1-2
Plug Crop Weeks:	5-7
Days from 50% to maximum germination:	3-5
Cover Seed:	Light cover

Plug Production
Stage 1
Moisture:	Level 4
Temperature:	65-68°F (18-20°C)
Light:	Optional

Stage 2
Moisture:	Level 3-4
Temperature:	65-68°F (18-20°C)
Light:	6-8 mol·m⁻²·d⁻¹
Fertilizer:	Less than 100 ppm N (Less than 0.7 EC)

Stage 3
Moisture:	Level 2-3
Temperature:	60-65°F (16-18°C)
Light:	8-10 mol·m⁻²·d⁻¹
Fertilizer:	100 to 175 ppm N (0.7 to 1.2 EC)

Stage 4
Moisture:	Level 1-2
Temperature:	60-65°F (16-18°C)
Light:	8-10 mol·m⁻²·d⁻¹
Fertilizer:	175 to 225 ppm N (1.2 to 1.5 EC)

Vernalization:	No
Propagation Key Tips:	Critical Daylength: 11 hours for 100% flowering but up to 3 weeks faster flowering at ≥13 hours than shorter photoperiods. For forcing info: See Perennials Forcing Guide. 1 to 2 seeds for 288/3 to 4 for 84. Plug PGRs: For Spring production, no PGRs needed. For Summer production under long day conditions, can use B-Nine/Alar (1,500 to 2,500 ppm spray). Short day bulk not needed for Autumn sales.

Growing on to Finish
Growing on Temperature:	(day) 60-70°F (16-21°C) (night) 55-60°F (13-16°C)
Target Media pH/EC (1:2):	5.8-6.2 pH 1.2-1.5 mmhos/cm
Fertilizer:	175 to 225 ppm N (1.2 to 1.5 EC)
Daylength:	Obligate Long Day
Daylength Notation:	Long Day required; minimum 11 hours for 100% flowering but up to 3 weeks faster flowering at ≥13 hours.
Fertilizer Notation:	Double the Sun has lighter green foliage than other Coreopsis. Option is to use Bittersalt (MgSO4) at 2gr/ltr in 2-3 sprays from 3-4 weeks after transplant.
Finishing Key Tips:	Apply PGRs when buds are visible.