Before planting it is a good idea to find your USDA Zone info to estimate your garden 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 to plant lithospermum by looking at the USDA zone info for Sahuarita.

Planting Calendar for Lithospermum

Frost tolerance for lithospermum:	Not tolerant of frost.
When to plant:	After the last frost has passed.

Since lithospermum require warm weather it's important to wait until after the last frost before you can plant them.

The earliest that you can plant lithospermum in Sahuarita 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 lithospermum and expect a good harvest is probably September. If you wait any later than that and your lithospermum may not have a chance to grow to maturity. If you are starting your lithospermum indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

In Sahuarita the average date of last frost happens on February 15. It might get as low as 20°F during the coldest months of winter.

It's important to remember that USDA zone info for Sahuarita is just an average and the actual date of last frost is different every year. Half of the time in Sahuarita you get a frost after February 15 so just be sure to be ready to cover your lithospermum if you have a surprise late frost.

USDA Zone Info for Sahuarita

Here is the info for USDA Zone 9a.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	20°F
Highest Expected Low	25°F

This means that on a really cold year, the coldest it will get is 20°F. On most years you should be prepared to experience lows near 25°F.

Plants to Grow in Sahuarita

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