Plant-Based Hair Colour Chart: Which Shade to Choose for Your Base and Your Grey Hair

A 100% plant-based colour chart never reads the way a chemical one does. With an oxidative tube, the number on the box is more or less what lands on your head, because the formula first lifts your natural pigment and then deposits a new one. Plant pigments work nothing like that. They sit on top of and within the fibre rather than replacing what is already there. So the swatch you see is never the colour you will get on its own; it is the colour that botanical pigment becomes once it has layered over your own base. Read the chart with that in mind and you will choose well. Read it like a chemical chart and you will almost certainly be let down.

This single misunderstanding is, in our experience, the real reason so many people conclude that "plant colour doesn't work". It does work, reliably, when you start from the right expectation and follow a proper two-step method. Let us walk through how to pick your shade with confidence.

Why a plant-based chart doesn't read like a chemical one

Botanical pigments such as henna (Lawsonia), indigo, cassia and amla are translucent. Think of them as a tinted glaze rather than a coat of opaque paint. When light passes through that glaze, it bounces back off your underlying hair, and the colour your eye registers is a blend of the two. A warm caramel layered over dark brown reads as a rich, glowing brunette. The very same caramel layered over light blonde reads far lighter and brighter. Identical product, two completely different outcomes, because the base did half the work.

That is why a responsible plant-based chart should always be presented as "your base + this shade = this likely result", never as a flat row of swatches floating free of context. It is also why a friend's gorgeous result is a poor guide for your own choice: unless your starting colour matches hers almost exactly, your finish will differ.

Starting base to expected result: how to read your row

The most useful thing you can do before choosing is to identify your true starting base in daylight, then read across to the realistic finish. Here is the broad logic:

• Dark brown to black base: warm shades deepen and add shine; reds and coppers read as subtle, sophisticated glints rather than bold colour. Expect richness, not a dramatic change of level.
• Medium to chestnut brown base: the most flexible territory. Caramel, copper, auburn, mocha and chestnut all read clearly and beautifully here.
• Light to medium blonde base: shades develop visibly and warmly. Coppers and golds can read quite vivid, so choose a touch deeper than the swatch if you want a softer effect.
• Grey or white base: this is the canvas where pigment shows most literally, which is exactly why grey needs its own thinking (more below).

The honest takeaway: the darker your base, the more subtle the shift; the lighter your base, the more visible and warm the result. Neither is better, they are simply different starting points.

Plant colour never lifts to a lighter shade: the golden rule

Here is the rule that saves the most heartache, so we will state it plainly. Plant-based colour cannot make your hair lighter. It deposits tone; it does not lift it. There is no botanical pigment that can decolourise, and anyone claiming otherwise is not being straight with you. Only chemistry, peroxide and bleach, can remove your natural pigment to take you lighter, and that is precisely the harsh process plant colour exists to avoid.

So when you read the chart, only ever look at shades equal to or darker and warmer than your base. You can deepen, you can warm, you can add red, copper or chestnut, you can blend greys, and you can refresh a faded colour. You cannot go from brown to blonde, you cannot achieve a cool ash, and you cannot brighten. Plant pigment runs warm by nature, so ash, platinum, icy or "cool" tones are simply off the table with any honest plant-based hair colour. Knowing this up front is the difference between delight and disappointment.

Grey hair: adjusting for your percentage

Grey and white hair has lost its own pigment, so it takes botanical colour very literally, and it can read warmer or brighter than the rest of your head. The proportion of grey you carry changes the approach:

• A scattering of greys (under ~30%): they tend to pick up a luminous, slightly brighter version of your shade, which usually reads as natural highlights. Most people are happy with a single application.
• Salt and pepper (~30–60%): here a two-step method really earns its place. Preparing the fibre first means the colour grips evenly across both pigmented and grey strands.
• Mostly or fully grey/white (60%+): on lighter target shades, greys can flash quite warm or coppery on a single pass. The dependable route to even, natural-looking coverage is a darker shade and proper two-step application.

One honest note worth repeating: near-100% grey coverage is realistic on darker shades. Trying to cover a head of white hair with a light golden tone in one go is where warmth can look uneven. Choose deeper, and you reward yourself with coverage that looks like hair, not paint.

The method that stops you getting it wrong

This is where the result is genuinely made or lost, and it is the part most other brands either forget or explain poorly, which is exactly how the "plant colour doesn't work" myth took hold. The fix is a proper two-step method, developed by our co-founder Jung Ae, that we supply as a complete pack rather than leaving you to improvise.

Step one is a dedicated sachet that prepares the fibre so it is ready to receive pigment evenly. Step two is the colour sachet itself. And because botanical pigments only release fully at the right temperature, every pack includes a thermometer, so you are not guessing whether the paste is warm enough. That small detail is the difference between flat, patchy colour and a deep, even, long-lasting result. We have not invented plant colour; we have made the existing craft far more reliable to use at home.

Our formulas are COSMOS Organic certified and made in France, with no ammonia, no PPD, no resorcinol and no oxidants. Rather than stripping the hair, the pigments coat and reinforce the fibre, which is why the method suits sensitive scalps. The approach was recognised at the Natexbio Challenge in 2024. None of that matters, though, if you skip the preparation step, so please do not. Follow the two steps, use the thermometer, and the chart will deliver what it promises.

Frequently asked questions

Can plant-based colour lighten my hair?

No, and any claim to the contrary is not honest. Botanical pigment only deposits tone; it cannot lift or remove your natural pigment. To go lighter you need chemical bleaching, which is exactly the harsh process plant colour avoids. With plant colour you can deepen, warm, add red or copper tones, blend greys and refresh faded colour, never lighten.

How do I know which shade to choose for my base?

Identify your true starting colour in natural daylight, then choose only shades equal to or deeper and warmer than that base. Remember the result is your base seen through a translucent glaze of pigment, so the darker your hair, the more subtle the change; the lighter your hair, the more visible and warm it reads. When in doubt, go one step deeper than the swatch.

Does plant colour really cover grey hair?

Yes, with two honest caveats. Near-complete coverage of around 100% is achievable on darker shades, and coverage is most even when you follow the two-step method that prepares the fibre first. On very light target shades, grey can read warmer or brighter, so for a head of white hair choose a deeper tone for natural-looking, even results.

Why does my plant colour look warmer than expected?

Plant pigments are warm by nature, so a touch of warmth is normal and intended; cool or ash results are not achievable with botanical colour. If the warmth feels too strong, it usually means the base was lighter or greyer than assumed, or the preparation step was skipped. Starting from a deeper shade and following both steps keeps warmth balanced.

How long should I leave the colour on?

Follow the timing in your pack, and treat the included thermometer as part of the method, not an optional extra. Botanical pigments only release fully at the correct temperature, so a paste that is too cool gives flat, patchy results regardless of how long you leave it. Warmth and the full development time together give the deepest, most even, longest-lasting colour.