When to plant petunias in Phoenix, Arizona
The best time to plant petunias in the Phoenix, Arizona area is from October to January. It's been very hot lately, and although it's October 4th, this year I'm going to wait another week. And yes, you can plant them all winter. If you get them in and established in October they will have their best chance to grow as much as possible before they die in April.
Yes, I know it seems kinda funny. I grew up in Minnesota, and the season for planting petunias there is spring. Here in Phoenix it's fall. It never gets too cold for petunias in Phoenix, you just don't want to plant them when the temperatures are too high, which can last through September, and early October. As I write this, it's 97 degrees. Too hot to plant yet! Next week!
I've planted petunias many times here at the Tropical Paradise. The photo at the top this post is from 2012, and that was a great year. Petunias love water, so you really can't overwater them here. And Phoenix tends to get what I call "Christmas Rains" which are gentle rains in the cooler months, which are wonderful for annuals.
My plan this year is going to be a little bit different. I'm always experimenting! I normally buy a lot of small plants, but instead I'm going to buy them at a gallon size. There are several places in the garden where I can move some river rocks temporarily, and that will give me places for planting right up front where I can water and care for them (and see them!) the best. As usual, I will mix in plenty of fresh potting soil in the planting hole, and add coffee grounds. I save my coffee grounds from when I have my morning coffee, and you can also get bags of it for free at your local Starbucks (they're happy to get rid of it, they're just going to throw it in the garbage). Coffee grounds help acidify the soil, bring organic nutrition to the plant, and besides, it smells good. Dig it in and mix it up into the planting hole, along with some moisture crystals and slow-release plant food.
I just learned from a gardening friend that purple petunias stay in bloom the longest, so I'm going to do purple and white. It should be beautiful! I can't wait for next week!
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