Approximately 1 seeds per gram
seed-counts are only a guide, not to be used for accurate calculations.
B and T World Seeds' reference number:
USDA average, annual, minimum temperature Zone:6
Type of plant - perennial
Flower: CRIMSON, RED, SCARLET
Height in meters: 0.30
Common names for Primula elatior Crescendo (R) Bright Red polyanthu:
Primula elatior Crescendo (R) Bright Red polyanthu
is included in the following B and T World Seeds flowering plant categories:
9: Alpine and Rock Garden Seed List (Hardy and Tender)
31: House and Container Plant Seed List
43: Herbaceous Border Plant Seed List
44: Cut flowers Commercial and other Recommended Varieties
161: Edible Flowers
185: Plant Species whose germination is improved by Smoke
Primula elatior Crescendo (R) Bright Red polyanthu seeds will usually germinate in 20-40 days, even under good conditions germination may be erratic. Normally will only germinate with light so surface sow. Sow Primula elatior Crescendo (R) Bright Red polyanthu seeds on the surface of a Peaty seed sowing mix at about 15°C.
Stratification (cold treatment or vernalization) Some seeds need to be overwintered before they will germinate. Some seeds need just a couple of weeks, others 3 months. Seeds can be stratified in dampened peat or sand, in a plastic box or bag at 4°C or 5°C in a refrigerator. The seeds should not be frozen or in a wet medium. Very small seeds can be sown on the surface of their growing medium, in pots sealed in plastic bags, and kept in the 'fridge. Many vernalized seeds need light to germinate when they are sown in the "Spring".
P.Sinensis germinates in the dark. Cold stratify 3 weeks.