These vegetables prefer cool growing temperatures 50-75 F (10-24 C). Hot weather tends to cause the maturing vegetable in this group to lose quality, become bitter and quickly go to seed.
They should be planted as early in the spring as your area allows giving them enough time to grow to maturity before the summer heat.
The vegetables in this category can also be started in midsummer to take advantage of the cool fall weather to mature. They will continue to grow well into the late fall early winter in most areas and in fact the flavor of vegetables in this group is improved by exposure to light frosts.
The 1st group of vegetables to plant in the spring are frost hardy vegetables. Onions are one of the hardiest of them all.
These vegetable seeds and seedlings will germinate and grow in the coolest soils. You can plant them in the early spring as soon as the soil can be worked and the soil temperature is consistently 40° F (4° C) and above. The young seedlings of plants in this group however should be protected in temperatures lower than 40° F (4° C).
As the plants mature, so does their hardiness, maturing plants in this hardy group can survive unprotected in temperatures as low as 20 °F (-7 C) before finally submitting. Generally, if not subjected to this temperature range for too long, when these hardy vegetables thaw out they will continue to grow.
As a rough guide you can plan to plant these vegetables as soon as 2 - 4 weeks before the average date of the last 32 F (0 C) freeze in the spring in your area.
In the list below are the vegetables in the 1st group to plant - frost hardy vegetables.
|Frost Hardy Cool Season Vegetables
The 2nd group of vegetables to plant in the spring are semi-frost hardy vegetables.
Taking the frost protection off these beets to early was a disastrous move.
These vegetable seeds and seedlings will germinate and grow in soil temperatures of 50° F (10° C) and above. You can plant these vegetable in the early spring as soon as the soil can be worked and the soil temperature is consistently above 50° F (10° C)
The young plants of these vegetables are much less tolerant of frosts than those in the hardy grouping but can still survive repeated light frosts in the 30-32 F (-1 to 0 C) range.
As a rough guide you can plan to plant these vegetables as early as 1 - 2 weeks before the average date of the last 32 F (0 C) freeze in the spring in your area.
In the list below are the vegetables in the 2nd group to plant - semi-frost hardy vegetables.
|Semi Frost Hardy Vegetables