The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

You should be able to estimate when it's a good idea to plant polygonums by looking at the USDA zone info for Cathedral City.

Planting Calendar for Polygonums

Frost tolerance for polygonums:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

You really shouldn't plant polygonums until after all chance of frost has passed because they are not cold tolerant.

The earliest that you can plant polygonums in Cathedral City is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant polygonums and expect a good harvest is probably September. If you wait any later than that and your polygonums may not have a chance to grow to maturity. You can get started a little bit earlier by starting your polygonums indoors.

Last Frost Date

On average all chance of frost has passed is on February 15 in Cathedral City. You can expect an average low temperature of 25°F in the coldest months of winter.

It's important to remember that USDA zone info for Cathedral City may not be accurate from year to year and the actual date of last frost is different every year. Since half of the time in Cathedral City last frost occurs after February 15 be ready to protect your polygonums in the event of a surprise late frost.

USDA Zone Info for Cathedral City

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

This means that on a really cold year, the coldest it will get is 25°F. On most years you should be prepared to experience lows near 30°F.

Plants to Grow in Cathedral City

You may be interested in your other planting guides for Cathedral City.