One of the first steps you take when you are estimating 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.

The USDA zone info for Piqua should be used to estimate when it's the best time to plant heliotrope.

Planting Calendar for Heliotrope

Frost tolerance for heliotrope:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

It's probably a bad idea to plant heliotrope until after all chance of frost has passed because they do not do well in cold weather.

The earliest that you can plant heliotrope in Piqua 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 heliotrope and expect a good harvest is probably August. Any later than that and your heliotrope may not have a chance to fully mature. Starting your heliotrope indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Piqua. It might get as low as -10°F during the coldest months of winter.

Remember that USDA zone info for Piqua is not always accurate and the actual date of last frost is different every year. Since half of the time in Piqua you get surprised by a frost after April 15 be ready to cover your heliotrope in the event of a surprise late frost.

USDA Zone Info for Piqua

Here is the info for USDA Zone 6a.

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

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

Plants to Grow in Piqua

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