Whether you live in a house or an apartment, your indoor cat craves fresh vegetation by instinct to medicate itself. Lawn grass and house plants can be unsafe because of pesticides or other harmful chemicals, and some wild grassy weeds may be poisonous. Nothing replaces fresh vegetation you know is safe because you grew it yourself. Grow your own Calendula, Catnip and Cat Grass so these herbal snack essentials will be available year-round for your cat's needs.