These Hothouse Covers fit on top of the hosta halo, turning it into a mini hothouse. These covers allow sunlight in and then holds back the warmth, making it ideal for protecting and encouraging growth in spring and autumn. Once the plants are established simply remove the lid during the hot summer months, leave the halo in place to protect from slugs and snails. Ventilation holes prevent overheating and allow water in, so you do not have to remove the lid to water. The cover also provides protection from pests, heavy rain and hail. The Hothouse Covers are available separately for customers who already have halos or buy packs of Slug Collars and Lids together and SAVE MONEY! (see Slug Collars/ Hosta Halos for offers).