This also brings the plants closer to the light. Light levels approximating those for cattleyas or 3,000 foot-candles are best. Plants can stand short spells of higher temperatures, but air movement, humidity and shading must all be increased. Cool night temperatures seem to promote flowering. Many species slower in the summer, and putting them outside in the summer may be ideal.
Most growers fertilize with diluted concentration every week to two weeks.
Plants grown in osmunda need fertilization only infrequently. Plants that rest in the winter may be repotted in the spring. The best flowerings come from large clumps of plants, so large baskets are usually used. Pre-moisten the potting medium so that the roots do not dry severely after repotting. Vigorous plants need repotting at least every three years, or sooner if the medium sours.