Young plant plugs are an excellent and cost efficient way for the experienced gardener to purchase ferns. They are young plants but developed enough to grow on with ease.
Typical plug plant with one Euro coin for scale
On arrival the fern must be potted up as quickly as possible into a 9cm or similar size pot. Those ferns being used in rock gardens, vivariums, Wardian cases containers, baskets etc can be planted straight away and watered regularly until established.
Most ferns are adaptable and a good potting compost will suffice. Some types such as Cheilanthes and Pellaea need extra drainage which can be achieved using sharp sand, grit or Perlite. Some ferns prefer ericacious compost such as Pellae, Blechnum and Osmundum, some, such as the Adiantums, prefer added dolomitic lime.
Water well once potted and keep compost moist, but not wet. Roots should appear at the base of the pot within a few weeks or months depending on type. Once there is sufficient root they can planted carefully (many ferns dislike root disturbance).