The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In Berlin you can determine when it's a good idea to plant heliotrope by checking out the USDA zone info.

Planting Calendar for Heliotrope

Frost tolerance for heliotrope:	Not tolerant of frost.
When to plant:	After the last frost.

It's probably a bad idea to plant heliotrope until after all chance of frost has passed because they are not cold tolerant.

The earliest that you can plant heliotrope in Berlin is May. However, you really should wait until June if you don't want to take any chances.

The last month that you can plant heliotrope and expect a good harvest is probably August. If you wait any later than that and your heliotrope may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your heliotrope indoors.

Last Frost Date

The average date of last frost is May 15 in Berlin. It might get as low as -25°F during the coldest months of winter.

Since the USDA zone info for Berlin may not be accurate from year to year the actual date of last frost is different every year. Since half of the time in Berlin you get a frost after May 15 be ready to cover your heliotrope if you have a late frost.

USDA Zone Info for Berlin

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°F

This means that on a really cold year, the coldest it will get is -25°F. On most years you should be prepared to experience lows near -20°F.

Plants to Grow in Berlin

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