Complete Guide to Tricolor Brake Fern Care and Growth

The Sweet Spot

Give this fern bright indirect light. An east window, with the plant about two to four feet back from the glass, is close to perfect. A north window works too if the fern sits right beside it. In a south or west room, keep it five feet or more from the window or behind a sheer curtain.

A quick test: hold your hand over the spot at midday. A soft, fuzzy shadow means the light is right. A sharp, dark shadow means it is too strong for this fern. Our indoor light guide explains how to read a room by eye.

Too Little Light

This is the mistake people make most with this plant, because ferns get labelled "low light" so often. In a dim corner it will survive, but new fronds tend to come up dull green or muddy bronze instead of red, and they arrive smaller and further apart. The whole point of the plant fades away.

In a dark winter room, a grow light set a foot or two above the fern for eight to ten hours a day keeps it growing and helps the colour.

Too Much Light

Direct midday or afternoon sun scorches the thin leaflets fast. You will see bleached, papery patches and crispy brown edges, which is leaf scorch. The soft red new fronds burn first, since they have not toughened up yet. A little gentle early-morning sun through an east window is usually fine; anything stronger needs a curtain.

The Colour Cycle

Every frond goes through the same change. It comes up from the centre of the clump red to pinkish bronze, with a pale silver-white band running along the middle of each leaflet on both sides of the midrib. The stalk and the midribs are red to purple. As the frond hardens over the following weeks, the red fades through bronze to mid-green, while the stalks and midribs usually keep their reddish tone.

So a mature plant is always a mix: green older fronds around the outside, a few coloured ones in the middle. That mix is the "tricolor" look.

What Controls the Red

Light is the main lever. Growers find the red is strongest on plants in bright indirect light, while new fronds in a dim spot often come up greener and duller. Steady growth matters too. A fern that keeps getting new fronds through spring and summer always has some colour on it, and a stressed or underfed plant puts out fewer fronds, so it looks greener overall.

Why Your Fern Is Turning Green

Green older fronds are normal and nothing is wrong. If the new fronds are also coming up green, move the plant somewhere brighter (still no direct afternoon sun), check that it is not drying out between waterings, and give it a light feed in the growing season. Expect the change on the next few fronds, not the ones already open.

Watering Frequency

This fern has very little drought tolerance. Water as soon as the surface of the mix feels barely dry, which in a warm room in summer can be every two to four days in a small pot. In winter, growth slows and the gap gets longer, but the root ball should still never go fully dry. Our watering guide covers the finger and pot-weight checks in more detail.

How to Water

Water slowly over the whole surface until it runs out of the drainage hole, then empty the saucer after ten minutes. Lifting the pot before and after watering is the best habit to learn; a light pot means it is time. If your tap water is hard and you see brown tips despite good care, switch to rain, filtered or distilled water.

Signs of Trouble

• Limp fronds and crispy leaflet edges after the pot went light: it dried out. Water thoroughly and trim the damaged fronds.
• Yellowing fronds, a soggy mix and a sour smell: too wet, often in a pot without drainage. Check for root rot.
• A whole frond collapsing after one dry spell is common with this fern. It rarely comes back, so cut it off and keep the next ones moist.

What the Soil Needs

The mix has to hold moisture without turning into mud. Fern roots are fine and need air as much as water, so a dense, heavy compost that stays wet for a week works against you. In the wild it grows on shaded forest slopes, in soil rich in leaf litter.

DIY Soil Mix

A simple blend that works:

• 2 parts peat moss or coco coir
• 1 part perlite
• 1 part leaf mould, compost or fine orchid bark

This holds water well, drains freely and stays open around the roots. Our soil guide explains what each ingredient does.

Pre-Made Options

A good-quality houseplant potting mix with a few handfuls of extra perlite does the job. Skip cactus mix, which dries out far too fast, and moisture-control mixes with water-holding gels, which can keep the core of the pot too wet. See our potting soil picks if you would rather buy a bag.

When and How Often

Feed once a month from spring to late summer, while new fronds are coming up. Stop in autumn and winter. This is a light feeder, and the roots burn easily, so less is better than more.

What to Use

A balanced liquid houseplant fertilizer diluted to a quarter or half of the label strength is all it needs. Always apply it to soil that is already damp, never to a dry pot. Our fertilizing guide and fertilizer picks cover the options.

Over-Fertilizing Signs

Brown, burnt-looking leaflet tips that appear soon after feeding, or a white crust on the soil surface, mean salts are building up. Flush the pot with plenty of plain water, letting it run through for a minute, and skip the next feed.

Ideal Range

Normal room temperatures of 60-75°F (16-24°C) suit it well. It is a tender fern and dislikes cold: below about 55°F (13°C) growth stalls, and it will not survive frost. Outdoors it is only grown year-round in warm climates, roughly USDA zones 9-11, in shade.

Drafts and Heat Sources

Keep it away from radiators, heating vents and the top of a fridge, where hot dry air quickly crisps the leaflets. In winter, pull it back from cold window glass at night. A summer outdoors in deep shade is possible, but bring it in well before nights drop toward 50°F (10°C).

Cold Damage

A fern left on a cold windowsill or in a car in winter often shows it a few days later: fronds go dark, limp and translucent, then brown. Cut the damaged fronds off, move the plant somewhere warm, and keep the soil slightly on the dry side of moist until new growth appears. As long as the crown is firm, it usually sends up fresh fronds in spring.

Ideal Humidity

Aim for 50% or higher. In dry air, especially once the heating comes on, the leaflet tips turn brown and the soft new fronds can dry before they fully open. A cheap hygrometer tells you where you stand.

Easy Humidity Boosters

A small room humidifier is the most reliable fix. A bright bathroom works well, and so does grouping it with other plants that love humidity. Its compact size also suits a glass cabinet. Misting alone raises humidity for minutes, so do not rely on it. Our humidity guide has more ideas.

Signs the Air Is Too Dry

The first sign is brown, crispy tips on the outer leaflets while the soil is still moist. Next, new fronds stall halfway open or the tips of the young red leaflets shrivel. If you see both in winter with the heating on, the air is the problem, not your watering, and a humidifier will fix it faster than extra water in the pot.

No Flowers, Ever

Like every fern, it never flowers. The colour you see comes from the fronds, so there are no buds to wait for and nothing to fix if it never blooms.

The Lines Under the Leaflets

On older fronds, look for a thin brown line along the edges of the leaflet undersides. In brake ferns, the spore cases sit along the margin, tucked under the slightly rolled leaf edge. This is a sign of a mature, healthy plant. Scale insects look different: separate raised bumps scattered on stalks and leaf surfaces that you can scrape off with a fingernail.

A Fern With Several Names

The labels on this plant are confusing, so here is the short version. Most shops sell it as Pteris quadriaurita 'Tricolor'. Botanists have also called it Pteris aspericaulis var. tricolor, and the original name from 1859 was Pteris tricolor. Kew's Plants of the World Online now files the variety under Pteris tricolor, while the RHS lists Pteris tricolor with P. quadriaurita 'Tricolor' as a synonym and marks the name as unresolved. The common names Painted Brake Fern and Tricolor Fern point to the same plant. Care is identical whatever the tag says.

Tricolor vs Brake Fern and Silver Lace Fern

The Brake Fern (Pteris cretica) and its white-striped form 'Albolineata' are the closest lookalikes. They also have a pale band down each leaflet, but their leaflets are mostly smooth, strap-like strips, their stalks are green or straw-coloured, and new fronds come up green, not red. P. cretica also keeps its looks in lower light, since it has no red to lose. If your plant has red stalks and red new growth, it is the tricolor.

The Silver Lace Fern (Pteris ensiformis 'Victoriae') is another silver-striped brake fern. It is smaller, with narrow, lacy leaflets, and it stays green and white all the way through. Tricolor has broader, deeply lobed, comb-like leaflets and the red flush on new fronds.

Other Red-Fronded Ferns

If you like coloured new growth, the Autumn Fern has coppery new fronds and takes real cold outdoors, and the Mahogany Fern has bronze-red new growth on glossier, finer fronds and handles dry air better. The Japanese Painted Fern is the silver-and-burgundy outdoor option for shady gardens.

Buying the Right Plant

Because the names are so mixed up, buy with your eyes rather than the label. A true tricolor has red or purple stalks, a silver-white band along each leaflet, and at least some red new growth in the centre. A green plant labelled "tricolor" may just be grown in low light, but a plant with green stalks and smooth strap-shaped leaflets is probably a P. cretica cultivar. Most plants are sold young, in 4-5 inch pots.

When to Repot

Repot in spring every one to two years, or when roots poke out of the drainage hole and the pot dries out in a day. A slightly snug pot is fine; this is a slow to moderate grower.

Choosing a Pot

Go up only one size, about 1-2 inches wider. Always use a drainage hole. Plastic or glazed ceramic holds moisture longer than unglazed terracotta, which suits a fern that should never dry out. Our plant pot picks cover the options.

Step-by-Step Repotting

1. Water the day before so the root ball is moist.
2. Ease the plant out and loosen circling roots gently with your fingers.
3. Set it in fresh mix at the same depth as before, with the crown level with the soil surface, never buried.
4. Fill around the sides, firm lightly and water thoroughly.
5. Keep it out of any direct sun for a week or two while it settles.

Our repotting guide has more detail.

When to Prune

Prune whenever a frond turns brown, crispy or yellow. There is no set season. Old fronds dying off one at a time is normal ageing and not a sign of trouble.

How to Prune

Use clean, sharp scissors and cut the frond stalk off at the base, close to the soil. Trimming only the brown tips leaves an odd, chopped look, so it is usually better to take the whole frond once more than half of it is damaged.

Clearing Space for New Fronds

Removing tired outer fronds lets more light reach the centre, where the red new fronds come up. Never cut into the crown itself, since that is where all new growth starts.

Best Method: Division

Division is the practical way to make more plants. The fern grows from a short, clumping rhizome, and a mature plant usually forms several crowns that can be separated. Do it in spring, when you are repotting anyway, so each piece has the whole growing season to settle.

Step-by-Step Division

1. Water the day before, then slide the plant out of its pot.
2. Shake or wash off enough mix to see where the crowns are.
3. Pull the clump apart by hand, or cut through the rhizome with a clean knife. Each piece needs its own roots and at least two or three fronds.
4. Pot each division into a small pot of fresh, moist mix at the same depth as before.
5. Keep the new plants warm, humid and out of direct sun, and keep the mix evenly moist. A clear plastic bag over the pot for the first two weeks helps.

Our plant division guide shows the method with pictures.

Tips for Success

Expect the divisions to sulk for a few weeks and maybe lose an older frond or two. That is normal. Spores are also an option, as with most ferns, but raising ferns from spores takes many months and a sterile, humid setup, so division is the realistic home method.

Common Pests

• Scale insects are the main one. Look for small brown bumps along the red stalks and midribs, often with sticky residue below.
• Mealybugs hide as white cottony blobs where the fronds meet the crown.
• Spider mites arrive in dry, heated air and leave fine webbing and a pale, speckled look.
• Fungus gnats breed in the constantly moist mix this fern needs.

Treatment and Prevention

Isolate the plant as soon as you spot pests. Scrape scale off with a fingernail, and dab mealybugs with a cotton swab dipped in rubbing alcohol. A lukewarm shower knocks off mites. Ferns are sensitive to many sprays, so test insecticidal soap or neem on one frond and wait two days before treating the rest. Yellow sticky traps catch gnats, and good humidity keeps mites away.

Sooty Mould

A black, dusty coating on the fronds is sooty mould growing on the sticky honeydew that scale leaves behind. Treat the scale first, then wipe or rinse the coating off gently.

Brown, Crispy Fronds

• Brown, crispy edges on the leaflets usually mean dry air or a pot that dried out. Raise the humidity and water more often.
• A frond that turns brown and limp all at once nearly always followed a missed watering.

Colour and Light Problems

• New fronds coming up green or dull is a light problem first. Move it somewhere brighter, still out of direct sun.
• Pale, faded leaves and bleached patches mean too much direct sun or sunburn. Damaged fronds will not recover, so cut them off.
• Stunted growth with tiny new fronds points to low light, a cold room or a long stretch without feeding.

Watering and Root Problems

• Yellowing leaves on several fronds at once, in wet soil, mean overwatering or poor drainage. One old outer frond yellowing now and then is normal.
• Wilting and drooping in dry soil is thirst. In wet soil it suggests root rot, so check for dark, mushy roots.

Solo Setups

Because the colour comes up from the centre of the clump, place it at eye level or slightly below, on a side table, desk or low shelf, so you look down into the new fronds. A plain green or neutral pot keeps the attention on the red and silver.

Grouped Arrangements

It looks good with solid green ferns, which make the red stand out. A Bird's Nest Fern adds broad, glossy leaves next to the fine lobed ones, and a Silver Lace Fern repeats the silver stripe at a smaller scale. Grouping also raises the humidity around all of them. Our popular indoor ferns roundup has more partners.

Glass Cabinets and Terrariums

A glass cabinet or a large terrarium solves the humidity problem in a dry home, and the compact size fits well. Choose one tall enough for 1-2 foot fronds, put it near a bright window or under a grow light, and leave a gap or open the door now and then so air can move. Moss and small, low plants at its feet suit it better than other large ferns that will crowd it.

Where Not to Put It

Skip sunny south windowsills with no curtain, dark hallways where the red fades, and anywhere above a radiator or next to a heating vent. A spot you walk past every day is a bonus, since you will notice a dry pot sooner.

Everyday Habits

• Lift the pot every couple of days. Weight tells you more than the surface of the soil.
• Water before it dries, not after. This fern punishes one missed watering more than most.
• Turn the pot a quarter turn each week so new fronds come up evenly.

Seasonal Habits

• Give it your brightest indirect spot in spring and summer, when it puts out the most coloured fronds.
• Run a humidifier from the day the heating comes on until spring.
• Repot or divide in spring, never in the middle of winter.
• Check the stalks for scale every month or two. The red stalks hide brown bumps well.