to make flower, you must combine Planter and Water. Now, to make the Planter, you must make Clay. You need to combine these :
Stone + Air = Sand
Sand + Water = Clay
Now, you need to create Dirt, which you will combine Wood and Stone. Then, you can proceed to combine Dirt and Clay to make the Planter.
You can go ahead and combine Planter and Water to get the Flower.
I hope it helps xD