Light
Bright indirect • approx. 10,000–20,000 lux
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Pteridaceae
Adiantum raddianum 'Fritz-Lüthi'
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- 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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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 'Fritz-Lüthi'
Quick Care Guide
Watering
Water when ~5–15% 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
Average
Max size indoors
Max. height: 50 cm • Max. spread: 55 cm
Toxicity & safety
Non-toxic
Origin & habitat
Cultivar of Adiantum raddianum; species 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 'Fritz-Lüthi'
Adiantum raddianum 'Fritz-Lüthi' is a maidenhair fern with black wiry stems and soft, triangular green fronds. The overlapping leaf segments form a layered fan of small rounded to triangular leaflets as the fronds arch outward from the crown.
This fern needs consistent moisture and humidity. A full dry-out can collapse the fine fronds quickly, while saturated substrate can damage the roots and crown.
Frond details of Adiantum raddianum 'Fritz-Lüthi'
- Plant type: Tender evergreen maidenhair fern with a tufted crown.
- Fronds: Triangular light green fronds on dark, wiry stalks.
- Leaflets: Rounded to triangular segments arranged in a fine layered pattern.
- Habit: Fronds spread horizontally or arch downward as they mature.
- Moisture: Needs evenly moist substrate and stable humidity.
- Light: Prefers bright filtered light or soft shade.
- Growth: Builds a fuller fern shape when warmth, moisture and humidity stay steady.
Fine fronds of Adiantum raddianum 'Fritz-Lüthi'
Adiantum raddianum 'Fritz-Lüthi' grows from a fern crown, sending up fine black stalks that carry delicate green fronds. Fresh growth is especially sensitive while unfolding, so moisture swings often show quickly as crisping or frond collapse.
Adiantum raddianum is native from Mexico to Tropical America and grows mainly in wet tropical habitats. Indoors, the cultivar keeps that moisture-dependent fern behaviour, with roots that need steady moisture and oxygen in the substrate.
Care for Adiantum raddianum 'Fritz-Lüthi'
- Light: Give bright filtered light or soft shade; direct sun can scorch the delicate fronds.
- Water: Keep the substrate evenly moist and water before the root ball dries out fully.
- Humidity: Higher humidity reduces crispy edges and helps new fronds unfurl cleanly.
- Temperature: Keep warm and stable, away from cold draughts and heat spikes.
- Soil: Use a fine but airy fern mix that holds moisture while draining freely.
- Repotting: Repot gently when roots fill the pot; divide only strong, mature plants with several active crowns.
- Fertilising: Feed very lightly during active growth; excess fertiliser can mark fine roots and fronds.
- Pruning: Cut dry or collapsed fronds at the base so new growth has space.
- Propagation: Division is possible on mature, well-rooted plants.
- Semi-hydroponics: This fern needs constant moisture with oxygen around the roots, so mineral setups require careful water-level control.
Frond problems in Adiantum raddianum 'Fritz-Lüthi'
- Crispy fronds: Usually caused by dry substrate, dry air, heat or too much direct light.
- Sudden collapse: Often follows a full dry-out or root stress from saturated substrate.
- Brown tips: Point to unstable moisture, low humidity or fertiliser build-up.
- Slow regrowth: A living crown can reshoot after frond loss, but recovery takes steady moisture and warmth.
- Pests: Check stressed plants for scale, mealybugs and mites around the crown and frond bases.
Safety for Adiantum raddianum 'Fritz-Lüthi'
Maidenhair ferns are generally considered non-toxic houseplants. Keep Adiantum raddianum 'Fritz-Lüthi' out of reach of pets that dig in pots or chew delicate fronds.
Botanical background of Adiantum raddianum 'Fritz-Lüthi'
Adiantum comes from the Greek adiantos, meaning unwetted, a reference to how water can bead on fern foliage. The species name raddianum honours the Italian botanist Giuseppe Raddi.
Adiantum raddianum was described by C.Presl and published in Tentamen Pteridographiae in 1836.
Adiantum raddianum 'Fritz-Lüthi' develops black stems, fine fronds and the soft texture of a moisture-loving maidenhair fern.
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.
Adiantum raddianum 'Fritz-Lüthi' FAQs – Cultivar Traits and Mature Shape
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