can you use ficus benjamina plants meant for indoor use, outdoors? My husband was told by the nursery that they would be fine...I am skeptical! we have an existing ficus hedge that is 15' in height that has become pretty thin at the base. We therefore want to fill in at the base using smaller plants. The plants would planted under the base of the existing hedge, so somewhat sheltered from direct sun and elements. we live in southern california where regular ficus thrive....please advise.
Ficus benjamina has a USDA hardiness zone recommendation of 9b-11. If you are within this area, you may be able to. The better question is do you really want to? If grown in a tree form, the root systems are massive and quite invasive. They are well known for breaking concrete sidewalks, patios, and home foundations. In fact, a close relative has the common name of "Rock Fig", not because it can grow on rocks, but because the root systems have been known to break large boulders. If you are lucky enough to have sufficient property, then go for it, otherwise you, the neighbors, and the city may appreciate your tree not growing where it is unwanted.
