Get more growth This is a pack of 20 replacement grow sponges for the Ivation Indoor Garden Kit. To get the full garden kit, you must order it separately. Keeping your plants growing indoors requires every part to function well. Keep your Ivation Indoor Garden Kit working well with this pack of 20 grow sponges for hydroponics. Use the hydroponic grow sponges to give your seeds to best conditions to grow, so you can go from seed to sprout quickly.