Collecting pressed seaweed and botanical specimens

Why pressed botanicals still captivate collectors

There is something quietly thrilling about opening an old album and finding a piece of the coast flattened into permanence: the ghostly lace of a Delesseria, the feathery fronds of Plocamium, the rubbery thong of a kelp holdfast pressed so thin it looks like a wood engraving. Pressed seaweed sits in a curious corner of collecting, part natural history, part folk art, and it has been drawing enthusiasts since the Victorians first took up their brushes and trays.

Botanical specimens share the appeal. A pressed fern, a pansy from an alpine meadow, a fragment of oak in autumn colour — each one preserves a particular day in a particular place, along with the handwriting of whoever gathered it. For collectors, that combination of fragility, documentary value and beauty is hard to resist.

A Victorian craze that still shapes the market

Seaweed albums flourished in Britain from roughly the 1840s to the 1870s, when improved transport and a fashion for seaside holidays put the shoreline within reach of the middle classes. Album-makers — often women — collected fronds at the strandline, floated them onto paper, and mounted them with neat handwritten labels recording species, locality and date. Some albums are modest; others are extraordinary works of arrangement, with specimens set in patterns like pressed flower pictures.

Prices remain surprisingly reasonable. A decent Victorian album with twenty or thirty identifiable specimens might fetch £40 to £150, while a well-documented album by a named collector, or one containing rare species, can run into several hundred pounds. Botanical herbaria sheets, exsiccata sets and pressed flower albums trade in a similar range. Condition drives value: foxing, mould spotting and acid burn from cheap mounting card will soften prices considerably, whereas crisp specimens on sound paper with good provenance command a premium.

Collecting your own, legally and sensibly

If you want to press your own, start with the rules. Never take plants from protected sites, nature reserves or Sites of Special Scientific Interest without permission, and never dig up a specimen by the roots. In the UK, many wild flowers are legally protected, and common sense applies to the rest: take one or two examples of abundant species, leave the rest to set seed, and photograph anything you cannot legally or responsibly remove.

• Collect seaweed from the strandline where it has already been cast up, not by tearing it from rocks.
• Choose fresh, intact fronds; decaying material will rot in the press.
• Record the date, exact location and habitat on a slip of paper and keep it with the specimen from the moment you pick it.
• Carry a flat plastic box or a folder of newspaper so specimens do not crumple on the way home.

Drying seaweed without mould

Seaweed is the trickiest material because it arrives wet, salty and often slimy. The classic method is float-mounting. Fill a shallow tray with fresh water and float your frond on the surface. Tease out the branches with a soft brush or a darning needle until the shape looks natural. Slide a sheet of herbarium paper or acid-free cartridge underneath, then lift the paper gently so the seaweed settles flat onto it. Drain briefly and blot the edges.

Rinse saltwater species in fresh water before floating if you plan to store them long term, as residual salt attracts moisture and encourages mould. Transfer the sheet to a press between blotters, with corrugated card on either side for airflow, and weight it with 5–10 kg. Change the blotting paper after the first 24 hours, then daily for three days, then weekly. Most seaweeds are bone dry within one to two weeks. Thick, fleshy species such as kelp may need longer, and some collectors split them lengthways to speed drying.

Pressing flowers, ferns and leaves

Terrestrial plants are more forgiving. Lay each specimen between sheets of blotting paper, sandwich with corrugated card, and stack under a weight of 10–15 kg — bricks, boards and heavy books all work. Keep the press somewhere airy and dry rather than warm; gentle air movement dries specimens better than heat, which can brown them.

Change the blotters daily for the first week, then every few days. Thin plants take about two weeks; ferns and woody stems three to four. Fleshy flowers such as orchids or succulents will not press well and are better preserved in silica gel, which also suits anyone wanting a little three-dimensional shape. Always keep the collecting label with the specimen while it dries, or you will end up with a drawer of unidentified leaves.

Mounting, storing and displaying your specimens

Good mounting is what separates a lasting collection from a box of brittle fragments. Use acid-free herbarium paper or mount board, and attach specimens with narrow strips of linen tape or gummed paper hinged over stems and thick midribs. Avoid running glue across the whole plant; a few well-placed hinges hold it securely while allowing future removal. Label neatly with species, location, date and collector.

• Store flat in acid-free folders in a cool, dark cupboard at around 45–55% relative humidity.
• Light is the great enemy of colour; keep albums closed and rotate framed pieces away from direct sun.
• If you frame a specimen, use UV-filtering glazing and a spacer so the plant never touches the glass, which invites condensation and mould.
• Inspect twice a year for pests. If you spot moth or beetle activity, seal the affected sheets in bags and freeze them for at least 72 hours before returning them to the collection.

Handled this way, a pressed seaweed or a pressed fern can outlast the collector by a century or more, which is precisely the point.