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As long as it gets enough water, it can take temperatures into the upper end of of most area's summer. The hotter it is, the more water it will need.

It is normal for them to bend over when the blooms start to get old. Once the flowers have been pollinated and start to set seed, they will naturally bend over, often all the way to the ground. You should even see the seed pod on the inside of the lily.

This article will help:
https://www.gardeningknowhow.com/plant-problems/pests/insects/grasshopper-control.htm

This article will help:
https://www.gardeningknowhow.com/plant-problems/pests/facts-about-slugs-and-how-to-kill-garden-slugs.htm

This article may help: https://www.gardeningknowhow.com/houseplants/hpgen/propagating-houseplants-from-cane-cuttings-and-divisions.htm

You can cut off dead flowers but leave as much stem as possible since these feed the bulbs for next year. Keep reasonably watered and that is all there is to it.