Try to aim for a seed spacing of at least
1.88 feet (58.0 cm) and sow at a depth of around
0.5 inches (1.27 cm). For optimal germination, soil temperature should be a minimum of
21°C / 70°F.
By our calculations, you should look at sowing Plum Granny about 14 days before your last frost date.
Plum Granny is hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.
Two to three inches wide.