B and T World Seeds' reference number: 38743
USDA average, annual, minimum temperature Zone:5
Type of plant - perennial
Flower: WHITE,with PINK or YELLOW eye
Foliage: (grows large in moist conditions)
Height in meters: 0.6

Primula japonica Postford White is included in the following B and T World Seeds flowering plant categories:
1:   Species in Stock at B and T
9:   Alpine and Rock Garden Seed List (Hardy and Tender)
43:   Herbaceous Border Plant Seed List
56:   Aquatic and Semi aquatic Plant Seeds
161:   Edible Flowers
170:  Primulaceae
185:   Plant Species whose germination is improved by Smoke

Germination guide
Primula japonica Postford White 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 japonica Postford White 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.