Before planting it is a good idea to find your USDA Zone info to figure out 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.

One way of estimating when it's a good idea to plant anchusa is to check out the USDA zone info for Zone 3b.

Planting Calendar for Anchusa

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

Anchusa do well in a bit of cold which tells us that you can plant them quite a bit earlier in the year than more sensitive plants.

The earliest that you can plant anchusa in Zone 3b 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 anchusa and expect a good harvest is probably August. You probably don't want to wait any later than that or else your anchusa may not have a chance to really do well. You can get started a little bit earlier by starting your anchusa indoors.

Last Frost Date

On average all chance of frost has passed is on May 15 in Zone 3b. You should expect an average low temperature of -35°F in the coldest months of winter.

Remember that USDA zone info for Zone 3b is just an average and the actual date of last frost changes from year to year. Since half of the time in Zone 3b it frosts late in the year after May 15 be ready to cover your anchusa in the event of one of those late frosts.

USDA Zone Info for Zone 3b

Here is the info for USDA Zone 3b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-35°F
Highest Expected Low	-30°F

This means that on a really cold year, the coldest it will get is -35°F. On most years you should be prepared to experience lows near -30°F.

Plants to Grow in Zone 3b

You may be interested in your other planting guides for Zone 3b.