From Johnny's Selected Seeds:
"Standard early variety.This hybrid shows unusual seedling vigor. Good quality, medium-size heads whether harvested in summer or fall. Good tolerance to moderate fall frost (25–32°F/-4–0°C). AAS winner. NOTE: When grown under fertility or moisture stress all cauliflower, but particularly Snow Crown, can show a purplish coloration on the undersides of the heads."
Cauliflower, Snow Crown 2-pack
$5.00Price