I have about 3 or 4 cactus blocks that I found during an excursion, but it was really far from my base and there wasn't a lot of it. Instead of making another long excursion just to search for more cactus, is it possible to plant what little I have in such a way that it will grow more cactus blocks for me to harvest?
If so, what is required for cactus to grow? I know trees only need light. Wheat needs water within 4 blocks and light, and reeds need water adjacent to them. What are the requirements for cactus?