If new growth gets pointy, lighter green or stringy, your plants need either more light, less water or both. Fertilize cacti and succulents monthly during the spring and summer but only once or twice all fall and winter. Use any good houseplant fertilizer, but dilute it a little more than the directions say. Many cacti and succulents bloom easily with the right care. Crown of thorns and pincushion cacti can bloom virtually all the time.
Some varieties simply don t bloom indoors or when they are young.
Saguaros need 60 to 90 years of Arizona heat and sun before they reach blooming maturity. Keeping cacti quite dry in winter helps stimulate blooming in spring or summer. When you do transplant them, use a special cactus mix or regular potting soil mixed with lots of fine gravel or sand for good drainage. You can be creative with cactus pots. Try some of the varieties with large, swollen stems like ponytail palms or jade plants in a bonsai pot for an easier Oriental look than true bonsai.