POPSUGAR Home Guess Who How Doesn't This Garden Grow? How Doesn't This Garden Grow? by Home 10/25/08 0 Shares Like us on Facebook There's one thing that these plants, known as Tillandsias, don't need to grow. They require minimal maintenance, and are ideal for you black thumbs out there. Can you name the one ingredient that these plants do not need to grow? Read More TillandsiasGardensPlantsGuess Who Get inspired with our daily newsletter DIY Vegetarian Love and Sex Home Food Tech Sign up with By signing up, I agree to the Terms and to receive emails from POPSUGAR.