The USDA Zone info is a great tool for gardeners to help us estimate 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 figure out when you can plant anchusa by using the USDA zone info for Robstown.

Planting Calendar for Anchusa

Frost tolerance for anchusa:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Since anchusa do well in cold you can plant them earlier in the year than other plants that might not handle the cold.

The earliest that you can plant anchusa in Robstown 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 anchusa and expect a good harvest is probably October. You probably don't want to wait any later than that or else your anchusa may not have a chance to fully mature. You can get started a few weeks earlier by starting your anchusa indoors.

Last Frost Date

In Robstown the average date of last frost happens on February 15. It might get as low as 25°F during the coldest months of winter.

Keep in mind that USDA zone info for Robstown is not always accurate and the actual date of last frost can change quite a bit from year to year. Half of the time in Robstown you get surprised by a frost after February 15 so make sure that you are prepared to protect your anchusa if you have a surprise late frost.

USDA Zone Info for Robstown

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 Robstown

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