Zinnia Seeds 7-10 days at 68-72 °F (20-22 °C). Higher temperatures can reduce germination and cause weak seedlings. Sow seeds in a well-drained media low in nutrients with a pH between 5.8 and 6.2. Cover the seed lightly with vermiculite.

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Growing on

Zinnia Seeds Grow at 60-65 °F (15-18 °C) for 3-4 weeks. Temperatures below 60 °F (15 °C) delays flowering. Provide good ventilation before sowing. Fertilize weekly at 200 ppm nitrogen in a well-balanced mix. The use of calcium nitrate will improve stem strength. For cut flower production, thin seedlings or plant plugs at 8-10″ (20-25 cm) in rows or 9-12″ x 12″ (23-30 cm x 30 cm) spacing in beds.

Media

Use a well-drained, growing perennial substrate with 15-30 % clay, 1-1,5 kg/m³ complete balanced fertilizer, iron-chelate, micronutrients, pH: 5.8-6.2. Field: loamy, sandy, humus soils with good drainage. Disinfect the soils in a greenhouse or before sowing. Standard fertilization: 80-100 g/m² of a slow-release fertilizer.

Zinnia Seeds Temperature

Grow at 15-16 °C or outdoors. temperatures below 10 °C promote yellow leaves. Zinnia does tolerate high temperatures of 25 °C but does not tolerate frost. It is recommended to harden for selling the plants slowly at 12-14 °C. In the field, Zinnia prefers warm and sunny locations. Protect the plants against the wind.

Zinnia Seeds Fertilization

Moderate fertilization levels are required. Fertilize the crop weekly with 100-150 ppm nitrogen, using a completely balanced fertilizer. Avoid high ammonium and high nitrogen levels, but high nitrogen levels result in soft stems. Stems that are too soft will break underneath the flower. Prevent magnesium deficiency by applying magnesium sulphate (0,05 %) 1-2 times and in case of iron deficiency apply iron-chelate for 1-2 times. The roots are sensitive to high salt levels in substrates. Field: N min soil value: approximately 120 g N/m