Quick answer: To use a filbert watercolor brush, load it fully, then choose which part touches the paper: the flat side for broad, soft-edged strokes; the rounded tip for petals, leaves and dabs; and the thin edge for lines. Rolling or twisting the brush mid-stroke changes the width, and pressing then lifting creates tapered shapes in one motion. Filberts shine wherever you want soft, organic edges instead of the hard corners a flat brush leaves.
A filbert sits between a flat and a round. It has a flat ferrule like a flat brush, but its hairs taper into an oval tip. That small change in shape makes it surprisingly versatile in watercolor. Learning how to use a filbert watercolor brush well gives you clean petals, soft clouds, rounded rocks and smooth edges with fewer strokes.
This tutorial covers how to hold and load a filbert, the core strokes, practical exercises, subjects where it excels, and the mistakes that make filbert marks look clumsy.
What a Filbert Brush Is and Why It Behaves Differently
The filbert is named after the hazelnut, whose oval shape the tip resembles. In watercolor ranges, filberts are usually made with soft synthetic fibers or a synthetic blend, sometimes natural hair. They are less common in watercolor sets than rounds and flats, which is why many painters are not sure what to do with one.
Three parts of the brush give you three different marks:
- The flat face lays down a wide stroke with softly rounded ends.
- The curved tip prints an oval or teardrop when pressed and lifted.
- The narrow edge draws a line, thinner than the face but softer than a flat’s chisel edge.
Because there are no sharp corners, filbert strokes blend into each other more gracefully. That is the main reason to reach for one.
Filbert vs Round vs Flat in Watercolor
| Feature | Filbert | Round | Flat |
|---|---|---|---|
| Tip shape | Oval, flattened | Pointed, cylindrical | Square, chisel edge |
| Typical marks | Petals, leaves, soft blocks, rounded shapes | Lines, details, variable strokes | Straight edges, washes, geometric shapes |
| Edge quality | Soft, rounded | Fine to bold depending on pressure | Crisp, hard corners |
| Wash capacity | Moderate | Moderate to high | High for its width |
| Best for | Florals, foliage, clouds, rounded forms, lifting softly | All-purpose painting and detail | Architecture, horizons, flat washes |
Many beginner watercolor kits include only rounds and flats. If you are choosing a kit and want variety in edge quality, our guide to beginner-friendly watercolor brush sets notes which sets add a filbert or oval shape to the mix.
How to Hold and Load a Filbert Watercolor Brush
Grip
Hold the brush a little farther back than you would a pencil, roughly a third of the way up the handle. That gives your wrist room to rotate the brush, which is essential for filbert work. Hold closer to the ferrule only for small, controlled marks.
Loading
- Wet the brush fully in clean water and tap off the excess on the rim of your jar.
- Pull the brush through your paint mixture, turning it so both faces pick up color.
- Check the load. For washes and soft blocks, keep it juicy. For defined petals or dry brush, touch the brush to a paper towel to remove some water.
- Shape the tip on the palette edge if it splits.
Double loading
Dip one side of the tip into one color and the other side into a second color. Then press and pull a stroke. The colors blend inside the brush and land as a two-tone petal or leaf. This is one of the most satisfying filbert techniques in watercolor.
How to Use a Filbert Watercolor Brush: Core Strokes
1. The broad stroke
Lay the flat face against the paper at a low angle and pull. You get a wide band with rounded ends. Overlap several strokes while wet for soft, even areas such as sky patches or background shapes.
2. The press-and-lift petal
Touch the tip down, press gently so the hairs spread into an oval, then lift straight up. Repeat in a circle around a center point and you have a simple flower. Vary pressure to vary petal size.
3. The teardrop leaf
Press the face down, then pull and lift while dragging toward the tip of the leaf. The stroke starts wide and finishes in a point. Add a slight curve to the pull for natural-looking leaves.
4. The edge line
Turn the brush so only the narrow edge touches the paper and pull. The line is softer than one made with a flat and wider than one made with a small round. Use it for stems, grasses and soft outlines.
5. The roll
Start on the edge and roll the brush between your fingers as you pull, so it moves from edge to face. The stroke swells from thin to wide. This creates ribbons, twisted petals and flowing drapery.
6. Dabbing and stippling
With a lightly loaded brush, tap the tip repeatedly for rounded texture, such as distant trees, shrubs or lilac clusters. Rotate the brush between taps so the marks do not look stamped.
7. Soft lifting
Rinse the brush, blot it on a towel, and press it into a damp area to lift pigment. The rounded tip lifts soft highlights on clouds, apples or cheeks without leaving hard rectangles.
Wet-in-Wet vs Wet-on-Dry With a Filbert
The same filbert stroke looks completely different depending on how wet the paper is. Knowing which to use is half the skill.
Wet-in-wet
Brush clean water onto the paper first, wait until the shine just starts to dull, then lay broad filbert strokes. The color spreads into soft, cloud-like shapes with no visible edges. This works well for skies, distant foliage and blurred backgrounds. Use a slightly stronger mix than you think you need, because the color lightens as it diffuses.
Wet-on-dry
Paint directly on dry paper and the filbert’s oval shape prints clearly. This is the mode for crisp petals, leaves and defined rounded forms. Edges will be soft-cornered but still distinct.
Damp paper, the in-between stage
When the paper is damp but no longer shiny, strokes spread a little and keep a recognizable shape. Many painters use this window for petals that look soft but still read as petals. Timing varies with paper, humidity and how much water you laid down, so test on a scrap strip first.
| Paper state | Filbert result | Good for |
|---|---|---|
| Wet and shiny | Color spreads widely, shapes vanish | Skies, glows, background blends |
| Damp, matte sheen | Soft shapes, slightly feathered edges | Soft petals, distant trees, cheeks |
| Dry | Clear oval and teardrop shapes | Defined petals, leaves, details |
Practice Exercises
Spend 15 to 20 minutes on these on scrap watercolor paper. They build the wrist control filberts reward.
- Petal rows: paint a row of press-and-lift petals, starting light pressure and getting heavier. Note how size changes.
- Leaf ladder: paint 10 teardrop leaves along a curved stem, alternating sides.
- Ribbon practice: make five rolling strokes, trying to keep the width transitions smooth.
- Value strip: using broad strokes, paint a strip that goes from dark to light by adding water each time.
- Double-loaded petals: try yellow and orange, pink and violet, or two greens.
- Cloud lifting: lay a blue wash, then lift soft cloud shapes with a damp filbert.
Subjects Where a Filbert Excels
Flowers
Tulips, daisies, cherry blossoms and roses all rely on rounded petals. A filbert can paint each petal in one stroke, which keeps watercolor fresh rather than overworked.
Foliage
Teardrop leaves and dabbed clusters make shrubs and trees read naturally. Mix two or three greens and alternate them for depth.
Clouds and skies
Broad, soft strokes on damp paper, plus lifting, make convincing cumulus shapes without hard edges.
Rounded forms
Fruit, pebbles, eggs and similar still life objects benefit from the curved tip, which follows form instead of cutting across it.
Portraits and figures
Soft edges around cheeks, jawlines and shadows are easier with a filbert than with a flat. It also shapes hair locks neatly with the roll stroke.
Water reflections
Short horizontal broad strokes with gaps between them suggest ripples on water.
Step-by-Step: A Simple Floral With One Filbert
- Mix colors: a petal color (such as a pink), a darker version of it, and a green.
- Paint the petals: use press-and-lift strokes around a center point, leaving small gaps of white paper between petals for sparkle.
- Add depth: while petals are still damp, touch the darker mix near the center so it bleeds outward softly.
- Paint leaves: double-load the brush with two greens and add teardrop leaves around the flower.
- Add stems: turn the brush to its edge and pull thin lines.
- Center detail: once dry, dab a small yellow or brown center with the very tip.
- Soften: if any edge looks too harsh, lift it gently with a damp, blotted filbert.
Choosing a Filbert for Watercolor
- Size: a medium filbert (roughly 1/4 to 1/2 inch wide, often labeled around size 6 to 10 depending on brand) is the most versatile. Add a smaller one for detail later.
- Fiber: soft synthetic or a synthetic blend is ideal. Stiff filberts meant for oil or acrylic hold too little water and leave streaks.
- Handle: short handles suit watercolor’s tabletop work.
- Tip: check that the oval forms cleanly when wet. A split or uneven tip makes petals ragged.
Oval wash brushes and “cat’s tongue” brushes are relatives of the filbert. The cat’s tongue has a more pointed tip and behaves like a cross between a filbert and a round. If you already own one, many of the strokes above work with it too.
Common Mistakes With a Filbert in Watercolor
- Using it like a flat. Pulling only straight strokes wastes the rounded tip. Rotate and press.
- Overloading for petals. Too much water floods petal shapes into blobs. Blot slightly for defined strokes.
- Too much pressure. Heavy pressure splays the hairs and loses the oval. Use medium pressure and let the brush do the shaping.
- Using a stiff filbert. Oil and acrylic filberts scratch and streak in watercolor.
- Repeating identical marks. Rotate the brush and vary pressure so foliage and petals look natural.
- Going back into drying paint. Touching semi-dry washes creates blooms. Either work wet-in-wet or wait until fully dry.
Caring for a Watercolor Filbert
Rinse thoroughly after use, reshape the oval with your fingers, and dry flat. Do not leave it standing on its tip in the water jar; filbert tips deform easily and lose their curve. Wash with mild soap occasionally to remove pigment buildup near the ferrule.
Tips by Skill Level
Beginners
Focus on three strokes: broad, press-and-lift and teardrop. Paint simple flowers and leaves until those feel automatic.
Intermediate painters
Add rolling strokes and double loading. Use the filbert for soft lifting and for rounding forms in still life.
Advanced painters
Combine the filbert with rounds and flats in a single painting for deliberate contrast between soft and hard edges. Try painting a whole loose landscape with only a filbert to sharpen your economy of strokes.
FAQs
What is a filbert brush used for in watercolor?
Filberts make soft, rounded marks. They are used for petals, leaves, clouds, rounded objects, soft edges in portraits and gentle lifting of pigment.
Is a filbert better than a round for watercolor?
Neither is better overall. A round is more versatile for lines and detail, while a filbert gives more consistent soft, oval shapes. Many painters use both.
What size filbert should I buy for watercolor?
A medium filbert around 1/4 to 1/2 inch wide works for most paper sizes. Add a smaller filbert for detail if you paint small florals.
Can I use an oil painting filbert for watercolor?
It is not ideal. Oil filberts are usually stiff bristle that holds little water and leaves streaks. A soft synthetic filbert made for water media works far better.
How do I keep my filbert tip from splitting?
Avoid heavy pressure, rinse thoroughly so pigment does not build up at the heel, reshape after cleaning, and never store it standing on its tip.
What is the difference between a filbert and a cat’s tongue brush?
A cat’s tongue has a more pointed tip, closer to a round, while a filbert’s tip is a broader oval. Both make petals and leaves; the cat’s tongue gives slightly finer points.
Next Step
A filbert gives watercolor a softer vocabulary: petals in one stroke, leaves that taper naturally and clouds without hard edges. Practice the core strokes and it quickly becomes one of the brushes you reach for first. If your current kit lacks one, compare the shapes included in our list of the best watercolor brush sets for new painters and pick a set that covers rounds, flats and a soft oval or filbert.
