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'Amity' rose Reviews & Comments
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Simon.........
The rose is beautiful ! When you say the rose is 'heat tolerant', what temps are you growing the rose in ?
Smiles,
Lyn
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I'm sorry I didn't reply to this, Lyn. I must have missed it somehow!
At the time the last photo was taken the temperatures were sitting between 30°C (84F) and about 40°C (104F). There were not many days above 37°C (~100F) with most sitting around the 30-35°C (84-95F) mark for most of late summer. It was an unusually hot, dry summer here this year (for a change).
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Hi Simon...
Even though I know I could not get the rose here in the US, I was just curious about what you considered "heat tolerant'. In my garden in the mountains of northern California, the summer temps run above between 35°C and 41°C every day for most of the summer and sometimes up to 44°C.
Thank you for taking the time to answer my question.
Smiles,
Lyn
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Thought I would add to this thread a little as a kind of update. This summer has been our hottest since we moved to Tasmania 9 years ago. For almost two months we have had next to no rain and temperatures have been sitting around the 35°C to 42°C mark for that whole time. This seedling has kept on flowering and its flowers have not scorched where most others have fried to a crisp. Hottest temperature we've measured in the sun was 42.3°C. It is growing in the ground with no mulch and I have been very happy with it. As it warms up the colour lightens up to magenta instead of purple.
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Simon ...
I am glad you updated this thread with additional information.
Since the rose did not go summer dormant during a continuous period of high heat and the blooms did not fry, I, too, would consider it to be a "heat tolerant" rose.
What plant characteristics do you think enabled the rose to withstand this kind of heat ? Does the rose have thick petal substance and denser foliage as compared to the roses which "fried to a crisp" ? Or ????
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I think it is due to a number of factors, Lyn, and it's hard to isolate them in this case. The rose is planted where it also gets a lot of radiated heat from the side of a building but there is good air-flow around it. The air flow around the flowers is improved even more as they are held up above the foliage. The flowers are thick with good substance but I'm not sure that helps with heat tolerance because if they get hot they are going to scorch no matter what. I have a feeling that the location and the flower position creates pretty efficient convective cooling. I also have a feeling it might have something to do with the foetida in the not-too-distant background. Given that foetida is found in some very warm, dry, locations in the middle east, I think it has some strategies up its sleeve to help it cope with intense heat. Maybe it has a natural sun-blocker produced in the tissue, because the foliage doesn't burn either. I am 99% sure that Sweet Chariot is the pollen parent, however, Sweet Chariot doesn't hold up anywhere near as well to the heat as this one. I think, also, that the pigments found in it might also be playing a part. There seem to be multiple 'layers' of colour and white seems to be one of them. Maybe it is reflecting the bulk of the radiant energy??? Another factor I think is playing a part is it has a very strong root system that seems to be able to supply water to the rest of the plant very effectively. Maybe if it can stay hydrated enough it reduces the chance of scorching. It's probably a combination of all these things so the real answer is.. I don't know for sure!
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Simon ....
Thank you for your thoughtful response.
As I experience this kind of heat every summer, I am always trying to determine just what makes one rose more heat tolerant than another. From my personal experience, I can confirm that air flow and a good, healthy root system play a huge role in heat tolerance for a rose.
In this garden, I have found that roses with thicker petal substance and dense foliage do withstand high temps better than other roses as does the maturity of the plant.
However, there are so many variables, I too, would have a difficult time identifying exactly what made one rose more heat tolerant than another.
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