Adiantum trapeziforme – free tropical ferns for life!

Adiantum trapeziforme (Diamond/Giant Maidenhair) -

Close-up of potted Adiantum trapeziforme (Diamond/Giant Maidenhair), growing in our courtyardHow wonderful! These tropical green beauties are found self-sown in every nook and corner, sort of. Like the Torenia fournieri and other ferns, they’re seen growing on mossy bricks, sharing ground or pot spaces, on crevices of walls and pavement, along the sides of drain and even sprouting from the drainage holes of standing or hanging pots.

Such abundance that sometimes we’re forced to uproot and throw them away when there’s one too many! Too bad that we just can’t afford to allow them to overrun our SMALL paradise, even though they’re free for life! ;)

Plant Profile, Culture and Propagation -:

  • Botanical Name: Adiantum trapeziforme
  • Common Name: Diamond Maidenhair, Giant Maidenhair, Trapezoid Maidenhair-fern.
  • Family name: Pteridaceae (Adiantaceae)
  • Plant type: A perennial landscape fern, native to the tropical rainforests of Central and South America.
  • Light: Part-shade to full shade with preference to bright indirect light or filtered sunlight. Intolerant to full sun that will scorch its leaves.
  • Moisture: Lots of water regularly and requires high humidity.
  • Soil: Light and loamy soil, moist as well as well-drained.
  • Propagation: Easily by crown division. Firstly, trim off to almost ground level most of the older rachises and remove withered fronds. Then dig it up and divide the rhizome by cutting through with a garden spade or sharp long-edged knife and finally replant the divisions into individual pots, being careful not to plant their crown below soil level, as it is from this point that new fronds will emerge.
    Spores on the fronds' underside of Adiantum trapeziformeDiamond Maidenhair can also be propagated from spores. Collect the ripe spores from under spore-bearing pinnules (leaflets) and sow on the surface of a humus-rich sterilized soil. Keep the growing medium always moist by covering with a plastic bag over the pot. Germination should take place within 6 weeks at a temperature of 68-70 degrees F, then transplant the tiny clumps of plantlets where desired. Here’s an interesting article by the Australian National Botanic Garden on fern propagation from spores that included the fern life cycle as well.
  • Potted Adiantum trapeziforme (Diamond/Giant Maidenhair) in our courtyardFeatures: Adiantum trapeziforme is a rhizomatous and evergreen fern, growing to a height of 1-3 feet tall and creeps as wide. Quite a hardy fern with slender and wiry stipes and rachises that are 6-15 inches long, erect (or drooping with age), shiny and brownish-black or almost black in color. Displaying luxuriant green foliage of graceful arching fronds 12-24 inches long, with a central pinna 4-8 inches long, and two to four more slightly shorter pinna on each side.

    Luxuriant foliage of Adiantum trapeziforme (Diamond/Giant Maidenhair)An attractive formation with each pinna holding green glossy pinnules (leaflets) that are trapezoid-like (diamond) in shape with an oblique outer side, and measures 1-2 inches long and 0.5-0.75 inch broad, with 2 margins smooth and 2 margins bluntly lobed by the numerous spores on the underside.
  • Care: The Diamond Maidenhair is such an easy-to-grow and easy-to-care fern. Much depends on where it’s situated and moisture received. For optimum growth, position it in part shade or where it can receive dappled sunlight, warmth and humidity. Soil should be kept constantly moist, to prevent its pinnules from drying up, not overly wet though. To maintain a humid environment in non-tropical regions, mist the foliage regularly or place indoor potted plants on pebbles in a saucer filled with water, with the pot bottom above the water. Pluck off dead stems to keep it tidy and repot every one to two years to revitalize soil and increase growth rate. Fertilize once monthly with a soluble fertilizer during the growing season. Hardly affected by diseases or pests like aphid, scale or mealybugs.
  • Usage: This Trapezoid Maidenhair-fern is very ideal as ground cover in garden beds or borders, as well as suitable in shady or woodland garden. Excellent for container gardening, be it indoors or outdoors. It’ll look fabulous in hanging baskets too with a mix of both erect and cascading fronds. Can also be used as a filler foliage in floral arrangements.
  • For sub-tropical & temperate regions: Cold hardiness: USDA Zone 10-11. Requires temperatures between 60-86 degrees F (15-30 degrees C) and less water in winter. Check Desert Tropicals and Royal Horticultural Society.

Some other ferns growing in our garden are the Adiantum capillus-veneris and Pteris ensiformis cv. Evergemiensis.

And, do enjoy a photo gallery of Adiantum (Maidenhair) ferns at Gymnosperms.org.

Last edited: 2008-06-13

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3 Responses to “Adiantum trapeziforme – free tropical ferns for life!”

  1. Margaret Says:

    I am looking to buy Adiantum trapeziforme. Do you have any to sell or know where I can get some in the US? Thanks.

  2. Jorn m Says:

    Sorry, but this fern featured is not Adiantum trapeziforme. In fact it is not an Adiantum (genus).

  3. Jacqueline Says:

    Are you doubly sure about it not being A. trapeziforme, Jorn m? We’d appreciate if you can share your reasons or basis for stating thus. Would you by any chance know the correct ID for our fern? Thanks.

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