One of the first steps you take when you are making a decision about your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

It's possible to estimate when it's possible to plant anchusa by reviewing the USDA zone info for Pella.

Planting Calendar for Anchusa

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

Anchusa are very cold tolerant which means that you can start planting them much earlier than other frost tender plants.

The earliest that you can plant anchusa in Pella 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 anchusa and expect a good harvest is probably September. If you wait any later than that and your anchusa may not have a chance to fully mature. Starting your anchusa indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is April 15 in Pella. In the coldest months of winter you should expect an average low temperature of -15°F.

Since the USDA zone info for Pella may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Since half of the time in Pella you get a frost after April 15 be ready to protect your anchusa in the event of a late frost.

USDA Zone Info for Pella

Here is the info for USDA Zone 5b.

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

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Pella

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