One of the first steps you take when you are making a decision about 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 estimate when to plant calliopsis by looking at the USDA zone info for Rosenberg.

Planting Calendar for Calliopsis

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

Since calliopsis require warm weather you really should wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant calliopsis in Rosenberg 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 calliopsis and expect a good harvest is probably September. Any later than that and your calliopsis may not have a chance to grow to maturity. You can get started a little bit earlier by starting your calliopsis indoors.

Last Frost Date

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

Just be sure to remember that USDA zone info for Rosenberg is just an average and the actual date of last frost changes from year to year. Half of the time in Rosenberg you get surprised by a frost after February 15 so just be sure to be ready to protect your calliopsis if you have a surprise late frost.

USDA Zone Info for Rosenberg

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 Rosenberg

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