Certified GKH Gardening Expert
Generally, these plants draw all the nutrients they require from the soil; therefore, regular fertilizing of figs is not usually necessary except for potted trees or those growing in poor soil. Fig fertilization also depends on whether your plant is young or mature.
For a young tree, fertilize in late winter or early spring. For mature fig trees, fertilize monthly from early spring until July. Use one-third pound of 10-10-10 per foot of plant height each time. A mature plant should develop only one foot of new growth each year.