B and T World Seeds' reference number:
USDA average, annual, minimum temperature Zone:3
Type of plant - perennial
Primula Rustic Reds
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
53: Bedding Plant Seed List
185: Plant Species whose germination is improved by Smoke
Primula Rustic Reds 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 Rustic Reds 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.