Summer Squash (including zucchini)
Pest management: Squash cultural tips, pests, and diseases
When to plant
- Transplant or direct seed: May–July, possibly April for transplanting
- For best results, wait until daytime temperatures are regularly over 70 degrees and soil temperature is over 65 degrees
- Start in pots for transplants: March–June; ready to transplant in 4 weeks
Harvest window: July–October, depending on variety
- Encourage bees for best pollination.
- Harvest squash while young and tender before they get too large and become tough.
- Follow good cultural practices to prevent powdery mildew.
- Treat squash bugs aggressively if found on plants.
Video: Zucchini to harvest in vertical cage [1:15]
Recommended Varieties for Santa Clara County*
|Astia zucchini F1||French variety for containers & small gardens. Glossy green fruits on compact vines, early and productive.|
|Cocozelle zucchini||Italian heirloom, dark green with light stripes. Compact and early. Pick as baby squash or up to 12".|
|Peter Pan pattypan F1||Light green, meaty scalloped squashes, vigorous and early. Delicious, sweet flavor. Pick at 1-3". AAS winner.|
|Romanesco F1||Italian type, dark green with light stripes. Early, productive, delicious.|
|Starship pattypan F1||Dark green scalloped squashes on vigorous, compact plant. Pick when small 3-4".|
|Sunburst pattypan F1||Tender, golden scalloped squash on a vigorous plant. Pick tiny with the blossom still attached or teacup-size. AAS winner.|
|Sunny Supersett F1||Delicious yellow crookneck with tender skin and nutty flavor. Bush plants are mildew resistant and productive.|
Other recommended varieties: Aristocrat, Goldrush, Horn of Plenty, Raven
* Many other varieties may also do well here in Santa Clara County. This list is based on UC Master Gardener trials, taste tests, and feedback from local growers.