Phoenix hastwo growing seasons . The first is from mid - February through the last of May , and the second growing season is from September to mid - November . January is Phoenix ’s only wintertime calendar month . summertime hotness can be brutal to roses . For the esurient gardener , summertime is like the desert ’s winter , as most plants are near quiescency due to the estrus . Understandably , gardening calendar are unique to this domain .
Bare-Root Roses
January is the best time to plant bare - root roses ; roses are dormant during this month , and mid - February distinguish the beginning of the growing season . plant life bare - root roses so that they are launch before the brutal passion of summertime transcends upon them ( summertime begins in May in Phoenix . )
Container Roses
Container - grown blush wine can be imbed much year round , due to their lay down theme system – although it is safe to avoid planting them during the summer month . temperature commence to chill down in September , which is also the start of the 2nd growing season . If you are go to set roses during September , await until the nighttime temperatures fall into the 70s . In October , as the weather cools down even more , glasshouse will be filled with container - grown plants , including rosiness .
Basics
summer in Phoenix can bring three-fold - digit warmth and scorch winds , presenting a real challenge to growing rose . However , if you take after some canonical process , your rose will hold up and prosper in this uttermost desert climate .
According to Marylou Coffman , a Gilbert , Arizona rosarian and All - America Rose Selection Committee jurist , " If there ’s a problem with your rose , nine time out of ten , it ’s related to water . " Remember to water often and deep . During the hottest calendar month , Coffman suggests watering at least three times a workweek ( using at least 3 to 4 gallons of water per flora during each tearing . )
It is very important to mulch in order of magnitude to keep the roots of the roseate cool , and keep moisture in the soil . Mulch also helps to keep weeds to a lower limit , and enriches the ground as it decomposes .
Your rose will need some good afternoon nicety during the fantastically hot summertime months . If this is n’t possible , spray your plants down two to three times a week . spray increase the humidity and cools down the plant ’s leaves .
A regular fertilizing syllabus will acquire strong flora with beautiful blooms and showy leave .
