What is a Tissue Culture Plant, and How Do You Care for One?
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A tissue culture plant is a young plant grown from a few cells in a sterile laboratory flask, rather than from a cutting or a seed. It arrives small, clean, and rooted in clear jelly. This guide explains what you are actually buying, how to get it out of the flask alive, and what to expect in the first month.
What is a tissue culture plant?
Tissue culture, sometimes written TC and known in the trade as micropropagation, starts with a tiny piece of a parent plant. That fragment is placed into a sealed vessel on a nutrient gel called agar, and it grows into a complete plant with roots and leaves without ever meeting soil, an insect, or a fungal spore.
Because the lab works from one parent, every plantlet is genetically identical to it. That matters for variegated plants in particular. A seed-grown Alocasia may or may not inherit its parent's pattern. A tissue cultured one carries the same genetics, though how strongly the variegation expresses still varies from plant to plant.
The plants we sell come from a partner laboratory in Thailand and arrive in sealed bags, one or five plantlets to a bag depending on the variety.
Why buy a plant in a flask instead of a pot?
The price
A rare aroid that costs several hundred pounds as an established plant is often available as a tissue culture plantlet for a fraction of that. You pay for the genetics rather than for the nursery's time growing it on. The trade-off is that you do that growing yourself.
No pests, ever
A sealed flask has never been exposed to thrips, spider mite, mealybug or fungus gnats. For anyone who has fought thrips through a whole collection, this alone is the argument. A tissue culture plant cannot bring anything into your home.
Access
Some plants simply do not exist in the UK as established specimens. Tissue culture is often the only legitimate route to them, and it is a route that does not involve stripping wild populations.
What you actually receive
Our tissue culture plants are sold on pre-order. We place a combined order with the lab on a set date, the lab prepares the plants fresh, and they fly to the UK together. That is why there is a date on every listing rather than a dispatch estimate.
When your parcel arrives you will find a sealed bag containing one plant, or five for the varieties listed that way, sitting in clear agar. The plant will be small, often a few centimetres, sometimes with a single leaf. This is normal and it is what you paid for. It is the beginning of the plant, not the finished article.
Some of our sets, the Nook starter set among them, come with the growing medium for this first stage. If you are ordering individual plants, have a medium ready before the parcel arrives.
Every plant is photographed on the day it is packed, and that photograph reaches you before the parcel does. Tissue culture varies from flask to flask, so you see the real plant rather than a stand-in.
How to deflask a tissue culture plant, step by step
Deflasking is the word for moving a plant out of its sterile flask and into growing media. It is the single point where most tissue culture plants are lost, and almost always for the same reason. Read the rinsing step twice.
The whole process, from sealed bag to finished pot.
What you need
- A bowl of clean water at room temperature
- A growing medium. If your order came with one, use that. Otherwise sphagnum moss, or a fifty-fifty mix of peat and perlite, or anything else fine and airy that holds moisture without turning sodden
- A small pot, or a clear takeaway container with a lid
- Somewhere warm and bright, out of direct sun
1. Open the bag and lift the plant out
Cut the bag rather than tearing it. The roots will be tangled into the agar and they are brittle, so take the whole mass out together and separate it in water rather than pulling at it dry. If there are five plants in the bag, deal with all five in one sitting. Once the seal is broken the bag is no longer sterile.
2. Rinse every trace of agar off the roots
This is the step that decides whether the plant lives. Agar is sugar, and any left on the roots will grow mould within about a week. Swirl the roots gently in room temperature water, change the water, and swirl again. Keep going until the roots feel clean rather than slippery. Lukewarm water loosens it faster than cold.
Do not scrub, and do not use soap or disinfectant. Patience does this job, pressure does not.
3. Pot into a damp, airy medium
If your order came with a growing medium, use that. If not, sphagnum moss works, and so does a fifty-fifty mix of peat and perlite. What matters is that it is fine, holds moisture, and still lets air through.
Moisten it and squeeze it out so it is damp rather than dripping, then settle the roots into it loosely without pressing down. Keep the crown level with the surface.
4. Hold the humidity high for two weeks
Inside the flask the humidity was close to 100 per cent, and the plant has no working stomata or wax layer to cope with room air. A clear container with a lid, a propagator, or a freezer bag over the pot will all work. Keep it at 20 to 26 degrees, bright but never in direct sun.
Check every day or two. If the walls are streaming with condensation, air it briefly. If you see any mould, remove the affected part immediately and air it more often.
5. Harden it off slowly
From about week two, start opening the lid. Half an hour on the first day, a little longer each time, over two to three weeks. If the leaves crisp or curl, you have gone too fast, so close it up and go back a step. Only once the plant is living in open room air, and pushing a new leaf, is it ready for a normal pot and normal watering.
The first month, and what is normal
Expect the plant to lose its original leaf. Leaves formed in a flask are built for a world with no air movement and unlimited water, and most of them are discarded once the plant starts making leaves suited to your conditions. A plant that drops its flask leaf while pushing a new one from the centre is doing exactly what it should.
Expect it to sit still for a few weeks. Root systems rebuild before anything happens above ground.
Do not fertilise for the first month. The plant has just left a nutrient gel and it does not need feeding. When you do start, use a quarter of the strength on the bottle.
Five mistakes that kill tissue culture plants
- Agar left on the roots. It moulds, the mould reaches the stem, and the plant is gone within a fortnight. Most first attempts fail here.
- Dropping the humidity too quickly. The plant cannot control water loss yet. Two weeks sealed, then three weeks of gradual opening.
- Burying the plant too deep. The crown has to sit level with the surface. Covered over, it rots before it roots.
- Direct sunlight. A flask leaf will burn through glass in an afternoon. Bright shade only.
- Feeding too early. Fertiliser on new roots scorches them. Wait a month, then feed weakly.
Notes by genus
Alocasia. Wants warmth above everything, ideally 22 degrees or more. Goes dormant if it gets cold, which looks like death but usually is not. Keep the medium damp and be patient.
Monstera and Epipremnum. The most forgiving of the group. They harden off quickly and move on to a normal aroid mix sooner than the rest.
Philodendron. Straightforward, but the variegated forms grow slowly while the plant is still small. Give them light.
Anthurium. The slowest and the most humidity-dependent. Many growers keep them in a closed container for months rather than weeks, and there is nothing wrong with that.
Homalomena. Roots readily and resents being kept too wet once established. Let the medium dry slightly between waterings after the first month.
Questions we get asked
How long until it looks like the photo on the listing?
Between one and three years, depending on the genus and your conditions. Alocasia and Monstera are quicker, Anthurium is slower. The listing photograph shows the mature plant so you know what you are growing towards.
Do I need to buy anything else?
Only a growing medium, and only if your order does not include one. The Nook starter set comes with everything. If you are ordering individual plants, sphagnum moss or a fifty-fifty peat and perlite mix will both do the job. The rest is already in your kitchen: a bowl of water, a small pot or a container with a lid, and a warm bright windowsill out of direct sun.
Will the variegation be the same as the photo?
The genetics are identical to the parent. How much of the pattern shows varies from plant to plant, and it can shift as the plant matures. Where a flask gives us more than one plant to choose from, we take the strongest variegation, and you see a photograph of the exact plant before it is posted.
What if it arrives damaged?
Photograph the sealed bag before you open it and contact us the same day. Plants that have travelled from Thailand occasionally arrive in poor condition and we deal with that when it happens.
Is tissue culture the same as cloning?
Yes, in the literal sense. Every plantlet from a flask is a clone of the parent. It is the same principle as taking a cutting, done at the scale of a few cells instead of a stem.
Where to start
If you have never deflasked anything, start with something forgiving and inexpensive rather than with the rarest plant you can afford. A plain green Alocasia or a Syngonium teaches you the same process as a four-figure variegated one, and it does not matter if you lose it.
We put together a starter set for exactly this reason. Three plants, and everything you need to get them into pots.
The Nook set, opened and potted.
Nook, your first tissue culture set
Or browse everything currently available.
