Light
Bright indirect • approx. 10,000–20,000 lux
Pteridaceae
Adiantum raddianum
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Every plant is hand‑picked for health and visual appeal, so you receive a strong, well‑established plant.
- Representative photos:
Product images show a typical plant of this variety. Natural differences in leaf number, shape or variegation are normal, your plant will still match in type and quality.
- Size details:
Listed sizes refer to pot diameter (cm) and approximate overall height (cm) from the base of the pot to the tallest leaf or stem.
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If you are buying the exact plant shown in the photos, this is clearly stated in the size section.
- Individual photos:
One‑off photos are only provided when this is explicitly mentioned in the size section. - For special traits or small quirks, please check the full product description.
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Your new plant has just travelled a long way and needs a calm start in its new home. For step-by-step unboxing and first-week care, check our after-delivery care guide. For deeper tips on how your plant settles in over the next weeks, read our houseplant acclimatization guide.
- Care basics , Main hub with links to all houseplant care guides.
- After delivery & first week , Unpacking, first placement, and early recovery.
- Light, How much light houseplants really need indoors.
- Watering , When to water and how to avoid root rot.
- Substrates & roots, Potting mixes and drainage for strong root systems.
- Humidity, When humidity matters and what actually helps.
- Fertilizing, Simple feeding routine without burning roots.
- Problems & pests, Yellow leaves, brown tips, bugs, and fixes that work.
- Semi-hydro, How to run low-maintenance mineral substrates.
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Adiantum raddianum
Quick Care Guide
Watering
Water when ~10–15% dry
Substrate
Moisture-retentive + airy • Steady-moist • Organic-forward • Fine
Temperature
Ideal: 18–24 °C • Avoid below: 15 °C
Humidity
Humid 60–80 % +
Growth habit
Upright clumping terrestrial fern.
Support
not needed
Growth speed
Slow
Max size indoors
Max. height: 45 cm • Max. spread: 50 cm
Toxicity & safety
Non-toxic
Origin & habitat
Native from Mexico to tropical America
Outdoor growing
Outside from 12 °C · sheltered from wind
How to read these values
These care values are quick reference points for indoor growing. Use them as a guide, then adjust for pot size, substrate, temperature and how quickly the substrate dries.
For more detail, read the full product description or visit our Plant Care Guides.
- Light: level and approximate lux at leaf level.
- Watering: “% dry” shows how far the substrate should dry before watering again.
- Substrate: structure, drainage, moisture retention, base material and particle size.
- Temperature: “Ideal” shows the preferred range; “Avoid below” marks the cold-stress threshold.
- Humidity: target range; steady conditions usually matter more than exact numbers.
- Growth habit: how the plant grows, such as upright, climbing, trailing, clumping or rosette-forming.
- Support: whether a stake, pole or trellis is needed, optional or unnecessary.
- Growth speed: expected pace under suitable indoor conditions; use as a guide, not a promise.
- Max size indoors: realistic long-term indoor size under good conditions.
- Toxicity & safety: irritation, toxicity or physical hazards such as spines or bristles.
- Origin & habitat: native range, hybrid background or typical habitat where relevant.
- Outdoor growing: when a potted indoor plant can be placed outside and what outdoor protection it needs.
Adiantum raddianum
Adiantum raddianum, commonly called Delta Maidenhair Fern, is a delicate tropical fern with fine black stalks and softly divided green fronds. It grows from short branching rhizomes, forming a light, airy clump with many thin stems rising from the base.
The fronds are triangular in outline and divided into many small rounded to wedge-shaped segments. New growth often appears pale green, then deepens as the fronds mature, giving the plant a layered texture.
Delta Maidenhair Fern traits
- Tropical maidenhair fern with fine black stems and branching frond stalks
- Triangular, finely divided fronds with small rounded to lobed segments
- Short rhizomes that build a dense, graceful clump over time
- Compact indoor size, often around 30–60 cm high in suitable conditions
- For warm, stable, bright-filtered growing positions
Fine fronds, origin and crown growth
Adiantum raddianum belongs to the Pteridaceae, a fern family that includes many maidenhair ferns. Its native range extends from Mexico through Tropical America, where it is associated with wet tropical habitats. It can grow as a terrestrial fern and also on moist rock surfaces, with fine roots held in constantly fresh, aerated material.
The fronds are thin, membranous, and carried on narrow dark stalks, so they respond quickly to shifts in moisture, heat, and air movement. The root system is fine and shallow, in a substrate that stays evenly moist while still allowing oxygen around the rhizomes.
In pots, Adiantum raddianum stays naturally compact and develops a full crown. The fronds rise upright at first and then arch as they mature, creating a soft fountain shape. Spore structures form along the folded margins of the leaflet segments, a typical maidenhair fern feature.
Keeping Delta Maidenhair Fern evenly moist
- Light: Give bright filtered light or gentle morning/evening light. Steady bright filtered light keeps the fronds greener and helps the crown produce more new stems.
- Watering: Keep the substrate evenly moist. Water when the top 10–15% of the mix begins to lose surface moisture, then let excess water drain fully. The fine roots and thin fronds react quickly when the root ball dries through.
- Substrate: Use a moisture-retentive but airy fern mix. A good base can include fine bark, coco coir, leaf-mould-style organic matter, perlite, and a small amount of mineral grit for structure.
- Drainage: Use a pot with drainage holes so the mix stays fresh around the rhizomes. The substrate should hold moisture evenly while water still moves through the pot after watering.
- Pot choice: Choose a pot that fits the root ball closely. A shallow or medium-depth pot suits the compact rhizomes and helps the root ball stay evenly moist.
- Temperature: Keep Adiantum raddianum warm and steady, ideally around 18–24 °C. Stable warmth keeps new fronds emerging; cool roots slow or stop new frond growth.
- Humidity: Higher ambient humidity helps the thin fronds stay supple. A plant cabinet, vitrine, closed growing shelf, or grouped humid planting can provide the steady air moisture this fern prefers.
- Air movement: Keep humidity steady, but let air move around the crown so old stems and the substrate surface do not stay damp for too long.
- Feeding: Feed lightly during active growth with a diluted, balanced fertiliser. Use low-strength feeding while the plant is producing new fronds regularly.
- Repotting: Repot during active growth when roots have filled the pot. Handle the rhizomes carefully, keep the crown at the same level, and water evenly after repotting.
- Pruning: Remove brown or tired fronds at the base with clean scissors. This keeps the crown open and allows new fronds to emerge clearly.
- Darker months: Growth may slow in darker months. Keep moisture steady, reduce feeding, and maintain warmth until new fronds start emerging more often again.
- Outdoor warm-weather placement: In warm weather, Adiantum raddianum can spend time outdoors in a sheltered, bright-shaded position after gradual acclimation. Bring it indoors before cool nights, drying wind, or unstable weather.
- Propagation: Mature plants can be divided by rhizome sections during repotting. Each division needs healthy roots, active growing points, and a warm, humid recovery period.
- Mineral and semi-hydro substrates: Fine fern roots prefer a moisture-retentive, evenly aerated root zone. Fully mineral systems need small particle size, stable moisture, careful water-level control, and conversion during active growth.
Maidenhair fern problems
- Crisping frond edges: Dry roots, low humidity, heat load or strong airflow can crisp the thin leaflet edges. Restore even substrate moisture and move the plant into steadier, brighter-filtered conditions.
- Fronds collapsing after a dry spell: Dry pockets can remain inside the pot even after light watering. Rehydrate gradually, trim fully dried fronds, and wait for new growth from the crown.
- Yellowing fronds: Stale moisture, poor drainage, strong fertiliser or low light can make fronds pale and tired. Keep the root zone evenly moist but airy.
- Brown patches on exposed fronds: Direct sun, hot glass and sudden placement changes can mark the soft fronds. Move the fern into softer filtered light and remove badly damaged fronds at the base.
- Sparse crown growth: Uneven moisture, weak light or excess unused substrate can slow fresh frond production.
- Fungus gnats: Keep the top layer airy, remove decaying debris, and improve surface airflow around the crown.
- Scale, mealybugs, or fern caterpillars: Inspect the undersides of fronds, the dark stalks, and the crown. Remove pests early and use gentle, fern-safe treatment so new fronds are not marked by scale, mealybugs or caterpillar damage.
Keeping the crown fresh
Adiantum raddianum is one of the classic indoor maidenhair ferns because it stays compact, branches well from the base, and forms a dense crown of fine stems. Steady moisture keeps the fine roots from drying through, and calm humid air keeps the thin fronds from crisping.
Fresh growth can replace damaged fronds when the crown and rhizomes remain healthy. Older fronds may be trimmed as they tire, while new fronds emerge from the base. Regular light grooming clears old dry stems so new fronds can emerge from the crown.
Maidenhair fern placement notes
Keep Adiantum raddianum away from pets and children that may nibble plants, and remove trimmed fronds or old substrate from accessible areas.
The Maidenhair Fern name
The botanical name is Adiantum raddianum C.Presl. The genus name Adiantum comes from the Greek adiantos, meaning “unwetted”, referring to the water-shedding surface of maidenhair fern foliage. The species epithet raddianum honours the Italian botanist Giuseppe Raddi.
Even moisture around the fine roots helps this fern keep producing new fronds from the base.
Plant names, growth habits, natural habitats and indoor care guidance are checked against trusted botanical, habitat and horticultural references before publication.View our plant care resources and references.
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Adiantum raddianum
Sale price€16,50
Adiantum raddianum FAQs – Fronds, Potting and Recovery
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