WATER:

TYPE A: (outdoor cactus)

TYPE B: (indoor cactus)

TYPE C: (desert cactus indoor)

LIGHT:

Light is essential for all Cactus, but the amount varies. Some types such as desert cactus require much more light than jungle cactus. Imagining there natural habitat is a helpfull trick...

Imagine yourself standing outside all day in the hot desert sun with no shade from morning to night... That is full light.  Then think again about standing in that south-facing window. Not only would the intensity of light be much less in the window, but the duration of light is also much shorter in the window. If you have a desert cactus indoors, it needs the most light as absolutely possible. If you have a jungle cactus outdoors, keep it on the shaded side.

OUTDOOR:

Too much light: When your plant is getting too much light, it can appear "off color," taking on a "bleached out" look, or turning yellow or even orangish. Keep in mind that these signs can also indicate other stresses, such as disease or too much water, so use common sense when making your diagnosis. This is the benefit of having it in a pot... move it.

If your plant is moved suddenly into very bright sunlight conditions, or if the weather suddenly turns hot with abundant sunshine, your plant can scorch. This can happen very rapidly and can scar the plant for the rest of its life, so be on alert for when such a condition might occur, and take precautions to prevent scorching.

Too little light: If your plant is receiving too little light, it might etiolate and/or appear to really reach for the light source. (Etiolation is the condition where a plant becomes "drawn," for example, a cactus plant that is normally round begins to look as if it is being stretched out from the growing point at its center). Your plant will suffer if left in such light conditions for very long. When transitioning such a plant to stronger light, keep in mind that it will be especially prone to scorching, so make the transition slowly.

INDOOR:

Note: Rotate your plant every two weeks so it gets an even amount of sun on each side.

Too much light: It is very rare for an indoor plant to have too much light, rather what happens more often is "uneven light". You can see signs of this when it appears "off color," taking on a "bleached out" look, or turning yellow on one side. Rotate the pot so that that the unbleached side faces the light.

If your plant is moved suddenly into very bright sunlight conditions, or if the weather suddenly turns hot with abundant sunshine, your plant can scorch. This can happen very rapidly and can scar the plant for the rest of its life, so be on alert for when such a condition might occur, and take precautions to prevent scorching.

Too little light: If your plant is receiving too little light, it might etiolate and/or appear to really reach for the light source. (Etiolation is the condition where a plant becomes "drawn," for example, a cactus plant that is normally round begins to look as if it is being stretched out from the growing point at its center). Your plant will suffer if left in such light conditions for very long. When transitioning such a plant to stronger light, keep in mind that it will be especially prone to scorching, so make the transition slowly.