Flower Staging (Double Pack) Fantastic value for money, this 4 tier Greenhouse Shelving will provide you with ample growing space. It is a great, robust storage solution for both walk-in and lean-to greenhouses as well as sheds and garages. Product Details 2 x Shelving Units 4 Tiers On Each Unit 90.5(L) x 28.5(W) x 107(H)cm .