You can mix liquid fertilizer at a rate of 5:10 to 5. You want to make sure that the fertilizer you use is slow-release so as not to shock your succulent. It should be fed in spring and summer as it is growing seasons. Then, it should not be left unfed the rest of the year. It is better to dilute the fertilizer with 50% strength soluble house plant food. It is possible to fertilize your plant as frequently as you wish, but most plants will be happy with just one feeding each year.