One of the first steps you take when you are estimating your gardening schedule is find your USDA Zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In Belfast you can figure out when it's the best time to plant plectranthus by looking at the USDA zone info.

Planting Calendar for Plectranthus

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

You can not plant plectranthus until after the last frost because they are not cold tolerant.

The earliest that you can plant plectranthus in Belfast 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 plectranthus and expect a good harvest is probably August. Any later than that and your plectranthus may not have a chance to fully mature. You can get started a little bit earlier by starting your plectranthus indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Belfast. In the coldest months of winter you should expect an average low temperature of -15°F.

Since the USDA zone info for Belfast is just an average the actual date of last frost is different every year. Half of the time in Belfast you get surprised by a frost after April 15 so just be sure to be ready to cover your plectranthus if you have one of those late frosts.

USDA Zone Info for Belfast

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 Belfast

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