Succulents need feeding, but in small quantities with perfect timing - here's a resource to give you some guidelines and choices.
Many succulent plants are extremely sensitive to salt - guess what most fertilizers are made from? That's right - salts! It will dry out the tiny root hairs and make it impossible for a plant to even get moisture, let alone nutrients.
I find the best way to feed succulents is with a tiny amount of steer manure or compost, mixed into the soil, which is gravelly or sandy, with perfect drainage.
I've used worm castings for this too, which gives a very mild boost, which is ideal for succulent plants.
Finding the right kind of fertilizer can take a bit of trial and error - learning how much to use, and how often, depends on the type of plant, how big it is, and how much soil is in the pot.
That's why I can't give you exact numbers - it's going to be different for everyone depending on their conditions (such as climate, weather, temperature, light levels and many other factors) and the age and growth habit of your succulent plants.
Generally, succulents don't require any fertilizer at all during the winter. Only fertilize when they're actively growing, and stop early so they have a chance to use up what's in the soil.
So, if you start to prepare them in late September for a winter indoors, in anticipation of a frost, then you would stop feeding them in early August, so the salts in the fertilizer don't build up in the soil when the plants start to go dormant.
Some plants absolutely demand a sweet soil, or one with low pH, and this product makes it easy to change the water and not only make it possible for the delivery of nutrients, but it also prevents you from over fertilizing in the mistaken belief that the plants need feeding.
Echeveria are the oddball among different types of succulents; they prefer (or require) a pH on the acidic side, not alkaline (or sweet) like most others.
One type of fertilizer that is popular is slow release fertilizer. It's used a lot in commercial greenhouses and nurseries because it can be applied to the top of the pot as a top dressing, or mixed right into the soil - sounds easy, right?
Do the same thing the big guys do; sprinkle a teaspoon of the dry castings on the top of the soil, close to the plant. Or mix it into the soil when you go to repot an overgrown plant. Or make it into compost tea.
Stay away from fish fertilizer too. The very smell of this will drive you outdoors to escape it, and the plants may do well for a while, but it's just too strong and can harm the roots of many succulents. Keep it where it belongs; in the vegetable garden.
This resource for finding the right nutrient source for your succulent plants will be revamped as I test and trial other systems and products.