Um, you actually DONT want to fertilize in the winter months (unless you have only winter growing plants). You want to keep your cactus dry and warm in winter with no fertilizer. Here in Phoenix, you can fertilize from April through October... usually I will not fertilize during the hottest part of the summer, mid June through August.

As for the Miracle Grow, Im sure you will hear different opinions on this but I will use it on cactus and succulents but ONLY AT HALF STRENGTH. I will use a mix (that was advised by a very reputable grower in Tuscon) of 1/2 strength Miracle Grow and 1/4 strength Super Bloom. Ive used it last year and this and Im happy with the results.

Ok, well, I do not have any other fertilizer because Miracle Grow works best for my plants, so for "half strength" should i just dilute the fertilizer with water?

MiracleGro has never caused me any problems. To mix at half strength, just put half as much as it says on the package in the water. So if the directions say a teaspoon per gallon, use half a teaspoon per gallon.

Ok! Thanks! Now that I got the fertilizing down, how about the watering? My cactus is a very small one, and I water it once every 2 weeks. Is that ok?

answering "how often should i water my plant" is the same as trying to answer the question "how often do you drink"

it depends!

there's no such thing as a schedule with plants. there are too many factors to consider. the best answer is to water your plants when they need it. depending on pot, soil, wind, etc this could be every day or it could be once a month.

watering every 2 weeks may kill the plant or it may not, without knowing all the parameters there's no way anyone can possibly provide reasonable insight

We'd need to know what kind of cactus, indoor or out, how big, is it in a pot, what kind of pot, how much sun, how hot the pot gets, what kind of soil, etc. Only thing I can say for sure is, unless it's an epiphyte, you definitely don't water it until the soil is good and dry.

Don't fertilizer in winter months, that time the plant is dormant...fertilizer only spring though summer