One of the first steps you take when you are making a decision about your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

By using the USDA zone info for Walnut it's possible to figure out when you can plant argyranthemum.

Planting Calendar for Argyranthemum

Frost tolerance for argyranthemum:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

Since argyranthemum are not cold tolerant you must wait until after the last frost has passed before you can plant them.

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

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

Last Frost Date

On average the last frost when the weather gets warmer is on January 31 in Walnut. In the coldest months of winter you should expect an average low temperature of 30°F.

Always keep in mind that USDA zone info for Walnut is just an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Walnut there is a last frost after January 31 so just be sure to be ready to cover your argyranthemum in the event of one of those late frosts.

USDA Zone Info for Walnut

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 Walnut

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