One of the best tools that you have as gardeners to help us estimate your gardening schedule is the 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.

By looking at the USDA zone info for Waterloo you should be able to estimate when it's possible to plant hamelia.

Planting Calendar for Hamelia

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

Hamelia are not cold tolerant which tells us that you have to wait until it warms up after the last frost before you can plant them.

The earliest that you can plant hamelia in Waterloo 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 hamelia and expect a good harvest is probably August. You probably don't want to wait any later than that or else your hamelia may not have a chance to really do well. You can get started a little bit earlier by starting your hamelia indoors.

Last Frost Date

On average the last frost is on April 15 in Waterloo. It might get as low as -20°F during the coldest months of winter.

Just be sure to remember that the actual date of last frost is just an average because it is based on the USDA zone info for Waterloo and it can change quite a bit from year to year. Half of the time in Waterloo you get a frost after April 15 so make sure that you are prepared to protect your hamelia if you have a late frost.

USDA Zone Info for Waterloo

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°F

This means that on a really cold year, the coldest it will get is -20°F. On most years you should be prepared to experience lows near -15°F.

Plants to Grow in Waterloo

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