Hello angiegist
Typically I refrain from giving fertilizer to my succulents. I would rather give them a good repot as needed. Oftentimes, it causes more harm if applied too much. They have very low needs compared to most houseplants and have been conditioned to use minimal that is why it is much easier to grow provided the other aspects of light, proper drainage, temperature and timing of watering is met.
When temps are getting cooler in winter, and if you need to move them indoors, the plants will naturally slow down in growth. They still need light but don't fertilize. I do not know what type of succulents you have nor where your location is. Maybe give us your general location and the manner you grow them like:
1)where are the plants now
2) how much light and orientation of light they are getting- is it natural light or artificial light; is it getting south sun or north sun orientation
3)what type of succulent are you growing- like cacti, these will not need fertilizer in winter, they are dormant, best to keep them dry and warm.
4)your watering frequency-when temps are cold, reduce or stop watering, cold and wet kills them faster, applying fertilizers will not help
5)how are they planted, what media are you using and are the containers with holes - is media quite porous and container well draining. Those fertilizers need to be flushed out too, otherwise too much concentration will damage the roots.
And, observe if they are actively growing, some are winter growers, some are summer growers. So if you do have to apply some fertilizer, do it at their active growing time. Best to use half concentration than indicated on the package, at times less is more.
