How to Fertilize miniature tree fern?
Very dilute fern feed monthly during warm active frond growth

miniature tree fern · Blechnum gibbum
Best grown under glass in frost-free conditions in a neutral to acid loam compost with bright filtered or indirect light, a humid atmosphere and good ventilation. Outdoors, for warmer UK counties only, grow in a very sheltered position in moist, humus-rich neutral to acid soil in full to part shade
Very dilute fern feed monthly during warm active frond growth