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I live in a hot (now 42 °C to 25°C) and dry (14% relative humidity just right now) city, and I have around 15 hours of sunlight. I wanted to plant some flowers on my roof, where there are no shadows during the day. It also can get subzero (around -10 °C) and 60 to 70% humidity in winters.

What flowers do you recommend for such conditions? For example I have also some Aptenia cordifolia and they're growing well in similar conditions.

Mahdi
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Sedums! They can be grown in very thin soil like a PICTURE. They are used in breath taking rooftop live aboard boats as well as vertical on the sides of buildings, walls. You will be blown away how beautiful, hardy and how they change with the seasons!

stormy
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