Catnip microgreens

Catnip microgreens are young shoots of Nepeta cataria, grown for cats rather than for a plate. They take roughly three weeks, come up unevenly, and are the slowest crop in this directory by a wide margin. They are also the crop most often confused with something else entirely: the tray sold in supermarkets as cat grass is almost always oat, wheat or barley, which is a different plant doing a different job.

Name

Catnip is Nepeta cataria, a member of the mint family. Seed is sold as catnip, catmint, or Nepeta cataria, and the names are used loosely. True catnip is N. cataria. Ornamental garden catmints such as Nepeta x faassenii are bred for flowers and are not the plant grown for cats. Buy seed named Nepeta cataria and check the botanical name on the packet rather than the common one.

Category

Catnip is a herb crop and behaves like one. It grows from very small seed, germinates slowly and unevenly, and forms fine stems under small paired leaves. It does not behave like a brassica, a pea, or a grain. Treat its timings as closer to basil or cilantro than to radish, and expect the tray to look sparse for longer than feels right.

Flavor Profile

This is the section where catnip differs from every other entry here, because the crop is not usually grown to be eaten by people. For a cat, the point is aroma rather than flavor. Catnip is also used by people as a herbal tea, where it is mild, grassy and faintly minty, without the sharpness of peppermint.

Not every cat responds to catnip. The response is inherited and a substantial minority of cats show none at all, which is worth knowing before growing a tray specifically for one animal. Kittens generally do not respond until they are several months old.

Key Nutrition

The supplied research does not include a source for a specific nutrition claim about catnip microgreens, for cats or for people, so this page does not make one. Do not turn the plant's effect on cat behavior into a health claim, and do not assume that a statement about mature catnip leaf, dried catnip, or catnip oil applies to a fresh microgreen.

If you sell catnip for animals, be aware that claims about an animal's health, mood, anxiety, or behavior can move a product from food into a regulated category. Ask your state department of agriculture before putting such wording on a label.

Difficulty

Advanced, and the hardest crop in this directory. Catnip punishes every shortcut. The seed is tiny and germinates over a long, ragged window, so a tray is never uniform. It resents overwatering at the fine-stem stage. It takes two to three times as long as a brassica for a fraction of the weight.

Be honest with yourself about why you want it. If the goal is a green tray for a cat to chew, oat or wheat cat grass is faster, cheaper, more reliable and is what most cats actually eat. Grow catnip when you want catnip specifically.

Days to harvest

Nobody has published a sow-to-harvest figure for catnip grown as a tray crop. Not a seed company, not an extension service. What exists is garden-start germination guidance, and the sources do not agree with each other:

• 7 to 10 days at 60 to 70°F
• 10 to 20 days at 70 to 80°F
• 7 to 10 days at 65 to 85°F

Those are days to germination for a garden start, not days to a cut tray, and converting one into the other is exactly the move this site refuses elsewhere. Treat them as a signal that emergence is slow and variable, which is the part every source agrees on.

What you can rely on is the shape rather than the number. Catnip is the slowest crop in this directory by a wide margin, emergence is spread over many days rather than arriving at once, and the aroma builds with the first true leaves rather than at the cotyledon stage, so the cut point is later than a brassica's on top of an already long crop.

Log your own. Record sow date, the date the majority is up, and the date you cut, across two or three trays at your own room temperature. That number is worth more than any range this page could print, because there is no published one to check it against.

Do not promise a two-week crop. Catnip is the entry most likely to make a production calendar wrong.

Seed density per 1020 tray

There is no published 1020 seeding rate for catnip. The best-known microgreen seeding trial covered 29 varieties and catnip was not one of them, and no second catnip-specific rate exists in the supplier material either.

So do not import one. A general classroom figure, or a brassica rate lifted from a crop of similar seed size, is not a catnip recommendation, and this page will not print a number it cannot stand behind.

What is known is the seed itself: it is very small, listed at around 46,000 seeds an ounce, so a rate that looks reasonable by eye will be wildly out. Weigh it, start deliberately light, and mix it with a little dry sand or fine vermiculite to spread it evenly across the surface.

Err light rather than heavy, for a reason specific to this crop. Catnip grows slowly and therefore spends an unusually long time under humid conditions before it is ready. A crowded tray has more of that time to break down, and with germination reported as low as 50% you may be sowing well above what actually emerges. Weigh what you sow, record what came up, and let two or three trays give you a rate that fits your own lot.

Soak

Do not soak catnip seed. It is too small to handle wet and will clump into patches that germinate as clumps. Sow it dry onto an evenly moistened surface, press it gently for contact, and leave it uncovered by medium.

Some growers cold-stratify catnip seed, holding it damp in a refrigerator for a week or two before sowing, to even out germination. It is worth testing on one tray if your stand is badly ragged, but treat it as an experiment to measure rather than a step to adopt on trust.

Blackout / weight period

Do not blackout catnip, and do not bury the seed. This is the one instruction on this page that runs opposite to the house default, and it is the mistake most likely to cost you the tray.

Catnip seed needs light to germinate. Its supplier guidance is to tamp it at the surface or barely cover it, which means the standard microgreen sequence of covering a tray for several days in the dark is working against this crop rather than for it. Bury it or black it out and you get poor, patchy emergence, which is then easily misread as a watering fault or a bad lot.

Use a clear humidity dome, not a blackout dome and not a weighted tray. The dome is there to hold moisture at the surface while the seed sits on top of the medium in the light. Weight is worse than useless here: catnip seedlings are far too fine to push up a weighted tray, and the published reason for weighting is large seed and hull removal in crops like sunflower and pea, which has nothing to do with seed this size.

No catnip-specific number of blackout days, weight or removal signal has been published. If a small pilot genuinely seems to need a light-excluding cover, treat it as an experiment on one tray and measure it against an uncovered tray beside it.

Because germination is spread over many days, you will always be choosing between the shoots that are up and the seed still coming. Ventilate rather than uncover-and-recover, and do not hold a full tray under a sealed dome waiting for stragglers: that is how a slow crop spends long enough in humid conditions to break down before it is ready.

Expected yield per 1020 tray

No measured 1020 yield for catnip has been published. It was not in the 29-variety seeding trial, and no second measured figure exists in the supplier material, so there is no number to quote and none is quoted here.

Two things are still worth saying. The trial's own authors caution that even measured yields may not transfer between systems, because density, harvest size, light, equipment and season all move them. And catnip is slow enough that whatever it returns, it returns after roughly three times the rack occupancy of a fast brassica, which is the part that decides the economics.

Weigh your first cut before you price anything. Selling an unmeasured crop by weight is how a slow tray quietly loses money. Catnip is normally priced as a specialty item or sold as a living tray, and until you have your own figure that is the safer way to sell it.

What goes wrong with this variety specifically

The defining problem is that catnip is slow and fine at the same time. Most crops are one or the other. A radish tray is out of the rack before trouble starts; a catnip tray sits for three weeks with fine stems in humid air, which is the condition every tray failure needs. Damping off, where seedlings collapse at the medium line, is the usual result. Give it more airflow and less water than instinct suggests, and bottom water rather than spraying a canopy that stays wet for hours.

The second problem is the uneven stand, and unlike cilantro this one cannot be fixed by preparing the seed. Catnip simply germinates over a long window. A tray will hold tall shoots, short shoots and bare medium at the same time, and it will not even out. Harvest what is ready rather than waiting for the tray to look finished, because the ready portion declines while you wait for the rest.

The third is the one people are most surprised by. A tray of catnip in the room is a tray of catnip to the cat it was grown for. Grow it somewhere the animal cannot reach, or it will be flattened days before harvest. This sounds like a joke and is the most common reason a home tray never gets cut.

Best For

Catnip suits growers who already run a reliable crop and want something with genuine specialty value: pet shops, groomers, veterinary practices, farmers market stalls with a pet-owning customer base, and direct sales to people who want a living tray rather than a dried product. It is a poor first crop and a poor volume crop.

If you sell it for animals, keep the same records you would for food: seed lot, sow date, harvest date. Rules for products intended for animals differ from those for human food and vary by state. Ask your state department of agriculture and the buyer what applies before selling.

Where To Buy

Buy seed named Nepeta cataria, untreated, and sold for sprouting or microgreen production. Check the botanical name rather than the word catnip on the front, since catmint and ornamental Nepeta are sold under overlapping names and will not do the same job. Ask for lot identification and a germination figure, because germination rate matters far more on a slow, ragged crop than it does on radish, and a weak lot costs three weeks before you find out.

This page may contain affiliate links or sponsored recommendations. They help support the site and do not change the growing cautions or the sales requirements described here.