Grafting is placing one plant onto another so the inserted plant grows off of the other. This is commonly used with fruit trees and cacti (especially the colored ones, the colored part usually can't survive on its own). Here I show how to graft one cactus onto another.
Note: This may not always work. Not all cacti may be compatible and sometimes by attempting grafting you may harm one or more of your cacti. You are solely responsible for damage and injury caused by this instructable.
Step 1: Materials
Here is a list of necessary materials (the cacti may vary. It should work with different species):
-A sharp knife (be careful with this)
-2 (or more) cacti
Step 2: Grafting
Step 1: Cut off a piece of cactus 2. If it's like the one I used then get about 3 segments (image 1). Make sure to get a nice clean cut.
Step 2: Make a cut in the cactus you are grafting onto (Image 2. Sorry but the picture of the cut got lost somewhere). Make sure this cut is clean as well. Make it deep enough so you can get a centimeter or two of the cactus 2 in it.
Step 3: Insert the part of cactus 2 into the cut and let time do its work now.
Step 3: Finished
Now you have an interesting cactus. If all goes well they will fuse together and now they should flower at different times of the year depending on the species of cacti used.