Growing plants is fairly simple. I grow TONS of them. You can get empty plant bowls from a Provisioner Shop and water pitchers inside a tavern.
You should read the stratics plant-growers guide so that you know what you are doing before you attempt the costly and time-consuming task of growing plants.
If you need seeds you can find some on my vendor. I have Bright Green Snake Plant seeds. I also have Greater Cure Potion kegs and Greater Poison Potion kegs which you will need. If you are not careful when growing your plants, you will also need a Greater Heal Potion keg.
Go to a moongate and take the Makoto-Jima exit in Tokuno Islands. Go North-East out of town approximately 3 to 4 screens.