The USDA Zone info is a great tool for gardeners to help us figure out 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.

You can figure out when to plant armeria in Waterloo by reviewing the USDA zone info.

Planting Calendar for Armeria

Frost tolerance for armeria:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Armeria are very cold tolerant which means that you can plant them much earlier than other frost tender plants.

The earliest that you can plant armeria in Waterloo is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant armeria and expect a good harvest is probably September. You probably don't want to wait any later than that or else your armeria may not have a chance to grow to maturity. If you are starting your armeria 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 Waterloo. In the coldest months of winter you should expect an average low temperature of -20°F.

Always keep in mind that USDA zone info for Waterloo is not always accurate and the actual date of last frost will vary from year to year. Since half of the time in Waterloo there is a last frost after April 15 be ready to cover your armeria if you have one of those late frosts.

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.