Rule of Thumb: Plant within four weeks after
last average frost date. For Zones 1-3, may be best to grow as potted
plants.
Hardiness Zone
Plant Around
10, 11
March
8, 9
April 15th - May 14th
6, 7
May
4, 5
May 15th - June 14th
1, 2, 3
June
Fall
Rule of Thumb: Late Fall, best planted earlier
than 4 weeks before ground freezes. Most Fall bulbs are not recommended
for Zones 10-11, unless pre-chilled.