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Thinning

Thinning of radish shoots to prevent overcrowding, thin radishes so plants are 1 inch apart. Photo source: eLearning Brothers
Thinning of radish shoots to prevent overcrowding, thin radishes so plants are 1 inch apart. Photo source: eLearning Brothers
Overcrowded plants cannot grow rapidly or reach a good size. Thin small root crops, salad crops, and those grown for greens early at the second or third true leaf stage. Thin root crops, such as beets or carrots, so the plants are 2 inches apart in the row. Thin radishes so plants are 1 inch apart and head lettuce to 12 inches apart.

The table below lists the standard spacing for each crop. However, different spacings may be required in your garden.

General planting requirements (distance)
Distance (inches)
VegetablesBetween plants in rowsBetween rows (no beds)
artichoke4860
beans, snap3045-55
beets1832
broccoli3632
cabbage2436
cantaloupes and other melons1272
carrots224
cauliflower2436
celery524
chayote72use trellis
corn, sweet1236
cucumbers2448
eggplant1836
garlic318
kale18-2424-30
kohlrabi324
lettuce2432
okra1836
onions, bulb318
onions, green1-26-12
parsley824
parsnips324
peppers2436
potatoes, sweet1236
potatoes, white1230
pumpkins4872
rhubarb3648
spinach318
squash, summer2448
squash, winter24-4872
tomatoes18-3636-60
watermelons24-6060-72

Source: California Master Gardener Handbook, Table 13.2, Adapted from Vegetable Gardening Illustrated 1994.