The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The earliest that you can plant myosotis in Petersburg should be estimated by looking at the USDA zone info.

Planting Calendar for Myosotis

Frost tolerance for myosotis:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Since myosotis are moderately cold tolerant you can plant them a little earlier in the year than other frost tender plants.

The earliest that you can plant myosotis in Petersburg 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 myosotis and expect a good harvest is probably September. If you wait any later than that and your myosotis may not have a chance to really do well. You can get started a little bit earlier by starting your myosotis indoors.

Last Frost Date

On average all chance of frost has passed is on April 15 in Petersburg. It might get as low as 5°F during the coldest months of winter.

Since the USDA zone info for Petersburg may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Half of the time in Petersburg it frosts late in the year after April 15 so make sure that you are ready to protect your myosotis if you have a late frost.

USDA Zone Info for Petersburg

Here is the info for USDA Zone 7b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	5°F
Highest Expected Low	10°F

This means that on a really cold year, the coldest it will get is 5°F. On most years you should be prepared to experience lows near 10°F.

Plants to Grow in Petersburg

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