There are lots of different kinds of petunias. For instance, the Madness Summer Series can take the heat, but petunias typically are not known for that.
Bob Morris
Bob Morris is a horticulture expert living in Las Vegas and professor emeritus for the University of Nevada. Visit his blog at xtremehorticulture.blogspot.com. Send questions to Extremehort@aol.com.
I was asked by several people about my reaction to the recent change in the USDA’s plant hardiness zone map.
Palm trees do not get borers or sunburned trunks. Borer damage doesn’t happen much probably because they are monocots.
Chilling injury is due to cooler or cold weather (above freezing) temperatures to tropical plants growing outside of — or close to — the fringes of their normal range.
Some composts are rich and full of nutrients. Other times they are not so rich, and the addition of a fertilizer might be needed.
The difference between Southwestern desert plants and other types of plants used for landscaping is the timing, or when the water is applied.
Some plants don’t grow well in rock, and roses are one of them. Nearly all landscape plants in the rose family like soil improvement and a moist environment when planted in desert soils.
Tomatoes stop setting fruit when air temperatures stay consistently above 95 degrees. The tomatoes that set earlier continue to grow and mature when it stays hot. If the air temperature drops below 95 for a couple of days, new flowers will again set fruit.
Q: The top ring of sago palmfronds died after I transplanted it but remain on the plant. I left this brown ring of fronds around the crown of the plant and it looks like new growth coming from the center is OK. Should I trim off the dead fronds without disturbing the crown or just let them fall off?
My class on creating a desert orchard will be held in November for four Saturday afternoon sessions. It begins Nov. 3. You can sign up for it on Eventbrite or contact me and I can arrange it for you.
Q: I have had much success with sugar snap peas, but lately I’ve been planting sugar snap peas and getting snow peas instead. Is it because the seed is old?
Q: I would like to grow my own rhubarb. Could you tell me where I can find the plant or the bulb, and when would be a good season to start?
Is there a difference between rosemary used for cooking and rosemary used in landscaping?
Question: I want to plant potatoes here in Las Vegas. Our season is timed different than others, though, so there aren’t seed potatoes available now for a mid- or late July planting.
The freeze is coming. Remember that the coldest is just before dawn. Clear, cloudless skies are more likely to give us lower temperatures and freezing; windy cold is worse than just cold. Cover tender plants before you go to bed and uncover them when it is no longer freezing.
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