You put the cactus on sand. There is no seed required. Also know they cannot grow right next to each other.
Cactus do not require seeds to grow. In fact, there is no such thing as a cactus seed. First, find a cactus and chop it down. Then, place a cactus pland on a piece of sand, and it will grow.
Nyan
In the minecraft pocket edition you cant get seed because in the computer version you get seeds from tall grass and there is no tall grass in the minecraft pocket edition
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Thebogsofgob
All seeds have lava lakes
You need to get the nether reactor core to get it
You have to go to the nether and collect them.
it is random generation
In Mine craft pocket edition the seed spinny is a good one you spawn on a tree you mine the tree and under it keep mining and you get coal iron gold and diamonds or you can look up seeds on google or youtube.
make a hoe and just keep hoeing random grass blocks eventually you'll et a seed
You cannot make your own seed all the seeds are random not hand made