Houston gardeners, keep an eye on forecast and be prepared for a hard freeze FacebookTwitterEmail 1of5 It’s time to prepare the garden for temperatures in the 20s. Mikewell Tolbert covers geraniums in preparation of freezing temperatures at the Mercer Arboretum and Botanical Gardens in advance of a past Houston freeze.Johnny Hanson, Staff / Houston ChronicleShow MoreShow Less 2of5 A freeze could nip oleanders and other cold-sensitive plants. Before removing the plants, wait to see if the new shoots emerge from the roots.Courtesy Neil SperryShow MoreShow Less 3of5 4of5 A storm that hit the greater Houston area left ice covering plants throughout the region.Rebecca Hazen / HCN staff / Rebecca Hazen / HCN staffShow MoreShow Less