![]() ![]() Most prefer rich, well-drained soil however, vermiculite tends to cause negative effects on fern growth, so this should be avoided. These lime-lovers include Southern Maidenhair ( Adiantum capillus-veneris) and Japanese Holly Fern ( Cyrtomium falcatum). Most grow best at pH levels ranging from 5.5 to 6.5 however, ferns naturally occurring in limestone soils prefer a neutral pH level. Perennial ferns are light feeders preferring well-balanced formulas (5-5-5) or a 2-1-2 ratio such as (20-10-20) will work Kelp meal is also a great amendment for ferns. Most Polystichum species (Christmas, Korean Rock, Tassel, and Western Sword) and a few Dryopteris (Recurved Broad Buckler) enter “dormancy” during periods of soil temperatures that exceed 95 degrees. While low temperatures induce dormancy, high temperatures can also stop growth, especially in species native to cooler climates. Dormancy can improve vigor and color in certain species, such as the Japanese Painted Fern ( Athyrium niponicum ‘Pictum’). ![]() When soil temperatures are too low, plants will go dormant, ceasing growth some varieties will defoliate at this time. Temperatures will also influence the growth of ferns. For example, Cinnamon Fern ( Osmunda cinnamomea) is photoperiodic and will enter dormancy caused by short days. As with tropical ferns, the same plant will have lush, dark green foliage at lower light levels and tough, light green to yellow foliage at higher light levels. Perennial ferns are not only sensitive to light levels, but also to durations. Most perennial ferns are understory plants and cannot tolerate very high light levels. ![]()
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