When can I plant Lithospermum in Zone 5b

One of the first steps we take when we are getting a good idea our gardening schedule is find our USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for our area.

You can determine when it's possible to plant lithospermum in Zone 5b by checking out the USDA zone info.


Planting Calendar for Lithospermum

Frost tolerance for lithospermum: Not tolerant of frost.
When you should plant them: After the last frost when the weather gets warmer.

You really shouldn't plant lithospermum until after the last frost has passed because they require warm weather.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant lithospermum
Possibly ok, but a risky time to plant lithospermum
Probably not a good time to plant lithospermum

The earliest that you can plant lithospermum in Zone 5b is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant lithospermum and expect a good harvest is probably August. Any later than that and your lithospermum may not have a chance to really do well. Starting your lithospermum indoors is a great way to get them started a little bit earlier.

Last Frost Date

In Zone 5b the average date of last frost happens on April 15. In the coldest months of winter we can expect an average low temperature of -15°F.

Always keep in mind that USDA zone info for Zone 5b may not be accurate from year to year and our actual date of last frost will vary from year to year. Since half of the time in Zone 5b we get surprised by a frost after April 15 be ready to protect your lithospermum in the event of a late frost.

USDA Zone Info for Zone 5b

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 Zone 5b

You may be interested in our other planting guides for Zone 5b.