Umm I don't know who told you there is cactus stew in minecraft because there is only Mushroom stew. Anyways you make the mushroom stew from a bowl (crafted like a bucket but with wooden planks) and red and brown mushroom on a crafting table, inv crafting.
You can use them as a form of pest control, mobs that bump into them will be damaged, you could keep them away from certain areas with them. Also, cactus blocks can be 'smelted' at a furnace to produce the cactus green dye.
You can cook it in a furnace and it becomes green dye.
Destroy cactus blocks in desert biomes and then plant it on sand.An it will grow.
Green:Cook cactus in the furnace to produce "Cactus green".Lime green:Combine cactus green with bonemeal to get lime dye.See the related link below for the official Minecraft crafting guide.
Burn cactus in a furnace.
You have to put a cactus in a furnace and then apply the resulting dye to the wool.
You can 'smelt' it to create the dye, 'cactus green'. Or you can plant a block on sand to make more grow, which can make more dye, or be used as part of a trap, as it hurts mobs.
Burn cactus in a furnace.
3-4 mins
cactus, or hunter.
From a cactus seed.
You put the cactus on sand. There is no seed required. Also know they cannot grow right next to each other.
You can dye sheep blue and yellow. Breed them and they make a green sheep, then shear/kill it for itβs wool. However there is no other way to get green dye other than cactus
with the clay soldiers mod? craft a clay soldier with lapiz lazuli or cactus green or something else that can be used to dye wool.... :)