Cactus and Succulent Fertilizer
Hello! I am a teenager that has just gotten hooked to the hobby of cactus and succulent growing. About a month ago my grandma gave me cuttings from her christmas cactus, jade plants, aloe vera, and Euphorbia Trigona. They all seem to have sent out roots and some even have new growth! I have been researching the plants and have learned a lot, but one thing I don't really understand is fertilization. I know I have to wait until the roots have developed further, so I still won't be doing it for a while, but I want to be ready when the time comes. How often do the plants need to be fertilized? I read somewhere it should be done with every watering, but I think that seems a little excessive. Also, what would you all recommend as a fertilizer? I don't really know if it will work, but in the garage I found some 16-12-12 slow release fertilizer. Would this work for the plants I listed above? I would prefer not to buy anything new unless kind doesn't work. Also, what is the difference between a 10-10-10 and a 20-20-20? Is it just that the Nitrogen, Phosphorus, Potassium are more concentrated in the second? As you can probably tell, I really have no idea what I am doing in terms of fertilization, so any help is appreciated!!!
Thanks so much!