Hi Warren, Reine des Violettes grew in Newhall, California, approximately 1,373 ft in elevation, mid southern California desert. There, the worst it got in winter in the 18 years I grew that garden was 15 degrees F, but that lasted for only a few hours a night for several nights running. Once I removed the ones I wished to maintain when I had to dismantle it, we had a particularly severe winter condition where temps of 7 F held for many hours for almost a week at night.
Summers were fairly long periods in the low nineties to low hundreds F. The most severe year saw a one hundred degree variance between winter low and summer high. 40 - 50 degree variances between day and night temps are common.
This seedling, the never flowering climber, germinated there and has grown here in the San Fernando Valley, city of Encino, all of its life. I’m just south of the Los Encinos Adobe, along the street where the Encino Oak Tree stood, up the mountain on the ridge between the Valley and West Los Angeles. The link below shows much about the area.
Here, a LOW temp in winter at night is the high thirties. Usually, it’s more in the low forties. Summer highs can be rather hot, but most often, there is an afternoon breeze which reduces the necessity of air conditioning. It’s close enough to Los Angeles and LA International Airport to have made it popular with Hollywood for decades.
It’s hot and dry enough to prevent Giant White Fly and make hibiscus sinensis flower most of the year. Citrus and low chill stone fruit sweeten up perfectly. It’s also cool and damp, as well as warm and damp enough to provide rust, black spot and mildew most of the year. Kim
Link: en.wikipedia.org/wiki/Encino,_Los_Angeles
Hi Kim; Your climate seems pretty similar to us here temperature wise, but during the summer here our humidity is quite low, around 20/30% . The only thing we do not have are sea breazes as we are 200 miles inland and during summer we get theses hot northerly winds and when its 113 F its not very pleasant. This area here , if you mulch well and keep the soil moist roses do extremely well without any problems.
I don’t know what the humidity was but a steaming hot cup of coffee thrown in the air outside just disappeared without a drop hitting the ground and the biggest snow drifts would build up inside vacant buildings. During the time of 24 hour daylight it was quite pleasant and a rose may have grown there for a few weeks.
Your climate sounds much like that of Wasco, CA, where the US rose fields have been for decades. Winter day temps are in the twenties F, summers can be well over a hundred and all with quite low humidity. Roses flourish there with irrigation.
We fortunately do get some sea breezes here. They and the 3" Styrofoam roof and treated windows are the only things which make it possible to not run the a/c during this heat spell! Mulch would definitely help make my roses happier and it will come. I have to complete some other issues and save the energy needed to haul it down three flights of stairs and around the house, first! Kim
Kim; the thing I miss the most is the smell of the beach at low tide. The house here has pretty good insulation, one summer night here, it was 100F at midnight. Hauling the mulch down three flights of stairs, just think of the work out and give gym away for the day. lol
The only plant growing a hip from the pollen of RdV is Golden Horizen(triploid), so this may be a clue. GH was a new plant here and it took a while to get going. I have no idea yet how well or IF the seeds of GH germinate.
I don’t envy that night temp, Warren. Having been born and raised in the American South East, I HATE hot nights, particularly with humidity. The only thing I really liked about the beach was the forty to fifty degree lower daytime temps. Those made it a lot nicer working outside. I didn’t care for the year round fungal issues nor the twelve month aphids and saw fly larvae. I was fortunate that I worked two blocks from the actual surf as I can’t stand the stench of the Pacific Ocean. The Gulf of Mexico and Atlantic didn’t have that stink. Those beaches were silica sand instead of decomposed granite, so when you got out of the water, you were clean. Not here! You’re muddy everywhere the DG touches you.
Golden Horizon’s seeds do germinate. Seeds supposedly from their pollen came up, also. You might have something interesting there, Neil! Kim
Just noticed a tagged hip on Ebb Tide with pollen from RvD and not just anything works with ET.