Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

It's possible to figure out when to plant iresene by checking out the USDA zone info for Scottsdale.

Planting Calendar for Iresene

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

You can not plant iresene until after the last frost when the weather gets warmer because they require warm weather.

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

The last month that you can plant iresene and expect a good harvest is probably September. Any later than that and your iresene may not have a chance to fully mature. Starting your iresene indoors is a great way to get them started a little bit earlier.

Last Frost Date

On average the last frost is on February 15 in Scottsdale. In the coldest months of winter you should expect an average low temperature of 25°F.

Since the USDA zone info for Scottsdale is not always accurate the actual date of last frost will vary from year to year. Half of the time in Scottsdale you get surprised by a frost after February 15 so make sure that you are prepared to protect your iresene in the event of a late frost.

USDA Zone Info for Scottsdale

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

This means that on a really cold year, the coldest it will get is 25°F. On most years you should be prepared to experience lows near 30°F.

Plants to Grow in Scottsdale

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