Answer: Orthodox advice on interior plants (and orthodox advice to staff in our industry) is that all plants should be fed roughly monthly from Easter to October. We use proprietary powder feeds mixed in our watering cans.However, some plants (particularly Ficuses, like Benjamina) start to suffer from feed deficiency (manifested by losing leaves in the case of Ficuses) by this time in the winter, so it has become our practice to give plants a gentle feed once or twice during the off season.
Some of my staff in fact claim never to stop feeding completely, merely to cut down the strength and frequency employed. One particularly venerable technician has a very complicated schedule involving different brands of plant food in varying quantities throughout the year, which for the life of me I can't fathom out. But hey, it works for him.
So in short, yes, you probably should give the fast growing plants like Ficuses a little feed about now. Of course if you have office plants looked after by Stewarts, we do all this thinking and feeding for you!
