Kenwood Press

Serving the communities of Kenwood, Glen Ellen and Oakmont

email print
Over the Garden Fence: 03/01/2017

When to plant peppers, melons, and eggplants

Cool days and nights can be a problem for tender warm-season crops such peppers, melons, and eggplants. Temperatures in the 40s wont kill these plants, but their growth will be stunted.

Wait to plant out these very tender crops until the lowest temperatures at night do not fall below 50F to 55F. (60 is even better!) If you plant sooner, use row covers, plastic tunnels, or cloches or even baskets or cardboard boxes at night to protect these plants from cold during their formative early weeks of development.

Pre-warming the soil before planting with heat-absorbing black plastic is a good idea as well.

Take heart; if you wait to plant eggplants, peppers and melons when the temperatures are optimal, you will actually get an earlier and more abundant crop.
Planting time for peppers

Peppers grow best in air temperatures 65 to 80F. Peppers are most easily grown from transplants. Start seed indoors seven to 10 weeks before the date you intend to set peppers into the garden. Peppers can be seeded in the garden or transplanted out two to three weeks after the last frost in spring, after the soil temperature has risen to at least 65F. In temperatures greater than 85F, peppers may drop their blossoms although set fruit will ripen. The ideal temperature for sweet peppers is a daytime temperature around 75F and a nighttime temperature around 62F.

Planting time for eggplants

Eggplant is sensitive to cold. It grows best where day temperatures are between 80 and 90F and night temperatures between 70 and 80F. Eggplant is best started indoors six to eight weeks before transplanting into the garden. Set transplants in the garden no sooner than two to three weeks after the average date of last frost in spring, or when daytime temperatures consistently reach 70F. Eggplants planted too early will not develop. Eggplant requires up to 150 frost-free days to reach harvest.

Planting time for melons

Sow cantaloupe and watermelon seed in the garden or set out transplants three to four weeks after the last average frost date in spring. Start melon seed indoors about six weeks before transplanting seedlings into the garden; start seed in biodegradable peat or paper pots at least 4 inches in diameter that can be set wholly into the garden so as not to disturb roots. Melons grow best in air temperatures ranging from 70 to 90F. If temperatures exceed 90F for several days, flowers will drop without setting fruit. Muskmelons require 70 to 100 frost-free days to reach harvest and will tolerate no frost. In cool or short-season regions, grow smaller varieties that come to harvest quickest.

How to give peppers, eggplants and melons a good start

Grow peppers, melons, and eggplants in raised beds or on hills or mounds that warm early in the season. In late spring, about the time of the last expected frost, dig holes about 18 inches deep and wide. Throw a handful of bone meal or all-purpose vegetable fertilizer (or half a shovelful of aged steer manure) into the bottom of each hole then backfill with a mix of aged compost, sand, and native garden soil or a half-and-half mix of store-bought planting mix and native soil.

If you are not planting in a raised bed, top each hole with the same mix to form a mound about six inches high and a foot or two wide. Water in the soil and cover the bed or mound with black plastic sheeting (plastic mulch) or black landscape fabric that will absorb solar heat. Let the soil warm up for 10 days or more before sowing or transplanting.

Preparing plant holes and mounds with aged compost is important for the success of melon, eggplant, and pepper cropsmore important than feeding plants later in the season. Compost and planting mix are rich in water holding humus. Consistent moisture is necessary for vine development and essential for fruit formation.

Steve Albert will give his annual workshop on tomato and pepper growing on March 25 at the Petaluma Library, and his annual workshop on tomato growing problems May 6 at the Healdsburg Library. Both workshops start at 10:30 a.m.

Steve Albert is the author of The Kitchen Garden Growers Guide available at He teaches in the landscape design program at the U.C. Berkeley Extension. He lives in Oakmont.

Steve Albert is the author of The Kitchen Garden Growers Guide available at He teaches in the landscape design program at the U.C. Berkeley Extension. He lives in Oakmont.


Recently Published:

09/01/2017 - Vegetables to plant in September
08/01/2017 - Planting the fall vegetable garden
07/01/2017 - Summer harvest tips
06/01/2017 - Vegetable watering tips
04/01/2017 - Best herbs for container growing
02/01/2017 - Plan your seed sowing in February
12/01/2016 - Dormant spraying fruit trees in winter
11/01/2016 - November garden roundup
09/01/2016 - Get your veggie garden ready for winter
08/01/2016 - Planting the second-season veggie garden
07/01/2016 - Hot weather watering tips
06/01/2016 - Feeding your summer vegetables
05/01/2016 - Peppers demand pampering
04/01/2016 - Growing blueberries in the Sonoma Valley
03/01/2016 - No-dig your way to success
08/01/2014 - Planting the late summer and fall vegetable garden
07/01/2014 - Summer harvest tips
06/01/2014 - Growing peppers and melons in the Sonoma Valley
05/01/2014 - Growing vegetables in a drought year
03/15/2014 - Soil temp and planting in March and April
12/01/2013 - The December vegetable garden
11/01/2013 - Planting spring bulbs
10/01/2013 - Fall planting: shrubs and perennials
09/01/2013 - Planting a fall harvest vegetable garden
06/15/2013 - Summer heat, water, and mulch in the garden

Community Calendar

Bill & Dave Hikes: Spring Lake, Trione-Annadel
Night Sky Trails