How to make pressed herbarium specimens for botanical display and ID
Pressing herbarium specimens is a simple, rewarding hobby that preserves plants for identification, study, and display. With a few tools and some patience you can create flat, durable specimens that highlight key features like leaves, flowers, and fruits. This guide walks you through practical steps from collection to mounting.
Step 1: Gather necessary materials
Collect a plant press or assemble one from two flat boards, corrugated cardboard, blotting paper or newspaper, and straps or heavy rubber bands. Include a field notebook, labels, a sharp pruning shear, tweezers, and a camera; these let you record habitat details and take reference photos before pressing. Good materials keep specimens flat and dry, preventing mold and distortion.
[Illustration: flat wooden boards, cardboard, blotting paper, straps, pruning shears, notebook arranged on a table]
Step 2: Choose and collect specimens
Select healthy, representative parts: stems with leaves, flowers, and fruit when available, typically 10–20 cm long but adjust for plant size. Collect multiple duplicates if possible and take a quick photo of the plant in situ including habitat and scale (ruler or coin). Record date, location (GPS or descriptive), habitat, and collector in your notebook; these data are critical for identification and future reference.
[Illustration: person cutting a plant with pruning shears in a meadow, taking a photo with a phone]
Step 3: Prepare specimens in the field
Trim extraneous soil and excess length, arrange compound leaves to show both surfaces, and partially open flowers with tweezers when necessary. Lay specimens flat on newspaper in a single layer without overlapping parts; small seeds or loose flowers can be placed in labeled envelopes. Preparing specimens carefully saves time and preserves diagnostic features during pressing.
[Illustration: several plant stems arranged flat on newspaper with tweezers and small labeled envelopes nearby]
Step 4: Arrange in the press
Layer blotting paper or newspaper, then cardboard for ventilation, and place specimens between papers with labels. Stack multiple specimens separated by absorbent paper and cardboard; avoid overcrowding. Tightening the press evenly distributes pressure so leaves and flowers dry flat and retain useful morphology for ID.
[Illustration: cross-section view of plant press layers: paper, specimen, cardboard, straps being tightened]
Step 5: Apply pressure and ventilate
Tighten straps or screws firmly so papers are compressed but not crushed; check pressure after 1–2 hours and again daily for the first 3 days. Replace damp blotting paper with dry sheets and ventilate the press in a warm, dry place (20–30°C) to speed drying; aim for specimens to be dry in 5–14 days depending on thickness. Consistent pressure plus periodic paper changes prevents mold and preserves shape.
[Illustration: pressed plant stack with straps attached, papers being changed in a warm sunlit room]
Step 6: Check and finish drying
Inspect specimens for dryness by feeling tissue firmness and ensuring no cool damp spots; thick stems may need 2 weeks or more. Once dry, flatten any curled parts with a warm iron (on low, between protective paper) or re-press for 24–48 hours. Proper drying ensures long-term stability and prevents deterioration in storage or display.
[Illustration: hand checking a dried herbarium sheet and using a warm iron over protective paper]
Step 7: Mount and label specimens
Mount dried specimens on archival paper with small strips of acid-free glue or linen tape placed at stress points (not over key features). Affix a printed label with scientific name, common name, date, location coordinates, collector name, habitat notes, and any reference number. Good mounting and complete labels make specimens useful for display, teaching, and accurate identification.
[Illustration: Mount and label specimens]
- Collect duplicates to keep one for study and one for display or sharing with a local herbarium.
- Press flowers open with small glassine packets for delicate petals to avoid color loss from folding.
- Change blotting paper every 24–48 hours during the first week if humidity is high or specimens are thick.
- Use archival, acid-free paper and adhesives to extend specimen lifespan beyond decades.
- For bulky materials (cones, fleshy fruits) slice thin sections to press or air-dry separately before mounting.
- Include a small ruler or color card on your field photo for scale and accurate color reference.
- Do not collect protected or endangered species without permits; check local regulations and obtain permission on private land.
- Avoid pressing very wet or muddy specimens without removing excess moisture first to prevent mold in the press.
- Handle toxic or allergenic plants with gloves and wash tools between collections to avoid irritation or spreading invasive species.
- Do not use household tape or non-acid-free glue for long-term mounting; these damage specimens over time.
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