Do Cactus Need Sun. Trichocereus cacti prefer it hot and sunny and grow extremely fast up to 40cm in a year when watered every week or two during. Succulents that have spines need bright light to grow well but they will exist with less.
General introduction Some of my seedlings in full sun. Too much heat can cause severe damage to your plants. Ephiphyllum that do not like much light let alone direct sunlight as they are programmed to grow sheltered from the foliage of trees in rainforestsAs for watering here the link dedicated to the topic there are two.
While all cacti have different light needs generally speaking most cacti need bright and direct sunlight.
Naturally cacti plants tend to do better when they receive a lot of exposure to light but they do need protection from intense heat and direct sunlight. Look at the plant to get an indication as to its origin and its light preferences. Unpack your Trichocereus cactus as soon as possible and for the first two weeks place in an area which receives bright filtered non-direct light. These plants dont enjoy being in the shade so its important to find the brightest spot you have in your home so that they get enough sunlight.