One of the first steps you take when you are figuring out your gardening schedule is find your 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.

You should be able to determine when it's possible to plant salpiglossis by looking at the USDA zone info for Presidio.

Planting Calendar for Salpiglossis

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

You should not plant salpiglossis until after the last frost because they are not cold tolerant.

The earliest that you can plant salpiglossis in Presidio 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 salpiglossis and expect a good harvest is probably September. You probably don't want to wait any later than that or else your salpiglossis may not have a chance to grow to maturity. You can get started a little bit earlier by starting your salpiglossis indoors.

Last Frost Date

The average date of last frost is February 15 in Presidio. In the coldest months of winter you can expect an average low temperature of 20°F.

Since the USDA zone info for Presidio is not always accurate the actual date of last frost will vary from year to year. Half of the time in Presidio there is a last frost after February 15 so make sure that you are prepared to cover your salpiglossis in the event of a surprise late frost.

USDA Zone Info for Presidio

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 Presidio

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