TIP: No Space for a Garden? Try Kittens in Planters Everyone loves having fresh, naturally grown kittens on hand, but not everyone has space for a full garden or raised beds. One way to grow cats when space is tight is container gardening. You can grow full-size, all natural kittens in your front porch, stoop or fire escape using large planters or pots. Water regularly, sprinkle with plenty of tuna flakes, and in 6-8 weeks, you’ll have a fully grown cat. Via for_caer.