One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The first opportunity to plant diascia in Holtville should be figured out by using the USDA zone info.

Planting Calendar for Diascia

Frost tolerance for diascia:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

You can plant diascia a little earlier in the year because they are moderately cold tolerant.

The earliest that you can plant diascia in Holtville is January. However, you really should wait until February if you don't want to take any chances.

The last month that you can plant diascia and expect a good harvest is probably October. Any later than that and your diascia may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your diascia indoors.

Last Frost Date

On average the last frost has passed is on January 31 in Holtville. In the coldest months of winter you can expect an average low temperature of 30°F.

Remember that USDA zone info for Holtville is an average and the actual date of last frost will vary from year to year. Since half of the time in Holtville last frost occurs after January 31 be ready to protect your diascia if you have a surprise late frost.

USDA Zone Info for Holtville

Here is the info for USDA Zone 10a.

Average Date of Last Frost (spring)	January 31
Average Date of First Frost (fall)	December 15
Lowest Expected Low	30°F
Highest Expected Low	35°F

This means that on a really cold year, the coldest it will get is 30°F. On most years you should be prepared to experience lows near 35°F.

Plants to Grow in Holtville

You may be interested in your other planting guides for Holtville.