Gardeners in USDA Hardiness Zones 10 and 11 can grow the plant outdoors, according to most rubber plant information. Outdoor rubber tree plants (Ficus elastica) may grow in Zone 9 if winter protection is offered. In the wild, outdoor rubber tree plants can reach 40 to 100 feet (12-30.5 m.) in height.Click to see full answer. Keeping this in view, when can I put my rubber plant outside? Winter Shelter for Summer Campers The ideal temperature range for the big, leathery leaved plant is 60 to 65 F at night and 75 to 80 F during the day. Move the plant back outside during the day when daytime temperatures rise for a week or so before moving it outside full time. do rubber plants need direct sunlight? Light: Rubber plants prefer bright, indirect light that isn’t too hot. Direct sunlight can result in scorched leaves. Water: These plants require more water during their growing season in the summer. You should keep the soil moist, but not drowning. Besides, can a rubber plant live outside in the UK? Milder winters mean that many plants from warmer climates can cope outdoors for most of the year. There were some casualties, but nine of the plants survived outside, although some such as rubber plants still needed to be brought in during the coldest parts of a typical British winter.How do you grow a rubber tree outside? How to Grow Rubber Plants Place plants in bright, indirect light (if available) or grow outside with plenty of room to spread out in zones 10 to 12. Plant rubber plants in Miracle-Gro® Indoor Potting Mix. Let the soil dry out slightly between waterings. After a month, feed when plants are actively growing with Miracle-Gro® Indoor Plant Food.