Big cactus:
Big cactus need about 1 quart of water every month.
Small cactus:
small cactus need to be watered at least every 3-4 days.
This info is only for 1 cactus.
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Cacti can live in the tropics, but they will probably die from too much water. Cacti retain water so if there is too much water, they basically drown. Tropics tend to have clay soil, and cacti need sand because of the way their roots grow and how the sand in the deserts retain the water, and clay might affect the cacti.
Cacti have hairs to not remove too much water .
Cacti grow in deserts because they don't need as much water as other plants. They retains water and juice inside the plant for a long time. That's why in the desert you always see birds inside cacti. They use it as shelter and food and water.
Cacti need little water to grow
they need little to no water for years
they do if they rot (if you water them too much)
Cacti can survive in deserts because they store water in themselves and use them to grow.
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For an ordinary plant you would need potting soil, water,and sunlight. For a cacti you woulgd need direct sunlight, rocks,sand,and dust.
Whenever the soil dries out completely it is safe to water your cacti. If you water them to much then they can develop root rot which will kill them.
Cacti and succulents store water in special cells in the plants' body for later use. The skin of the cacti has a waxy coating to prevent water loss.
Cacti are known to not require much water and some are quite edible.