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

By using the USDA zone info for Sycamore it's possible to determine when to plant catharanthus.

Planting Calendar for Catharanthus

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

Since catharanthus are not cold tolerant it is important to wait until after the last frost before you can plant them.

The earliest that you can plant catharanthus in Sycamore 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 catharanthus and expect a good harvest is probably August. Any later than that and your catharanthus may not have a chance to fully mature. If you are starting your catharanthus indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

On average all chance of frost has passed is on April 15 in Sycamore. You should expect an average low temperature of -15°F in the coldest months of winter.

It's important to remember that USDA zone info for Sycamore is not always accurate and the actual date of last frost changes from year to year. Since half of the time in Sycamore it frosts late in the year after April 15 be ready to protect your catharanthus if you have a surprise late frost.

USDA Zone Info for Sycamore

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 Sycamore

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