How to Grow Wheatgrass Indoors

Growing wheatgrass indoors takes 7–10 days from seed to harvest. Soak hard winter wheat berries overnight, sow them densely in a shallow tray with an inch of potting mix, cover for the first four days, then move to a grow light or bright window until the grass reaches 6–8 inches tall.

Why grow wheatgrass at home?

A single 2-ounce shot of fresh wheatgrass juice at a juice bar typically costs $3–6. Growing your own full tray at home costs about $1–2 in seeds and potting mix and produces 8–12 ounces of juice — enough for four to six shots. At that cost difference, a single growing tray pays for the entire setup within the first month of regular juicing.

Beyond cost, home-grown wheatgrass is fresher. Wheatgrass begins to oxidize within minutes of juicing; juice you grow and process at home reaches you within seconds of harvest, while commercial shots may sit refrigerated for hours or days. Freshness translates directly to flavor — properly harvested home-grown wheatgrass has a mild, sweet-green taste that is far less sharp than the bitter shots sold at many commercial outlets.

Wheatgrass also grows faster than almost any other indoor crop. The 7–10 day cycle from seed to harvest makes it easy to set up a rotating system — one tray started every two to three days — that delivers fresh grass for juicing every morning with almost no ongoing effort once the routine is established.

What you need to grow wheatgrass

You do not need a specialized kit to grow wheatgrass successfully. The core supplies are:

Total startup cost for one tray: $10–20 in seeds and growing medium. Add a grow light for $25–50 if your space lacks strong natural light, and a masticating juicer for $40–150 depending on the model. A manual hand-crank juicer at $30–50 is the lowest-cost entry point for juicing.

Step 1: Choose the right wheat berries

Not all wheat varieties produce equally good wheatgrass. Two types work well for home growing:

Hard red winter wheat — the traditional choice for wheatgrass. Produces a slightly more robust, earthy flavor with a deep green color. This is the variety you will find labeled specifically as “wheatgrass seeds” at most garden and health food suppliers. Germination rate is high and the grass grows dense and upright.

Hard white wheat — milder flavor, lighter green color, slightly faster germination. A good choice for people who find hard red wheat wheatgrass too sharp or bitter when juiced.

Soft wheat varieties — work for growing but produce softer, less fibrous stems that juice less efficiently. Not recommended if juicing is your primary goal.

Barley — a completely different crop. Barley grass has a distinct flavor profile and different growing requirements. If you want barley grass, follow specific barley grass instructions — it is not interchangeable with wheat for wheatgrass juice.

Buy seeds labeled specifically for sprouting or growing, not seeds sold for milling into flour or for baking. Flour wheat may be treated with anti-fungal coatings or stored at conditions that reduce germination rate. Look for untreated hard wheat berries from cooking supply stores, health food retailers, or Amazon listings specifically for sprouting or wheatgrass.

Step 2: Pre-soak seeds for 8-12 hours

Pre-soaking is not optional for wheatgrass. It activates the seed, initiates germination chemistry, and cuts total grow time by one to two days.

1. Measure 1.5–2 cups of dry wheat berries per 10x20-inch tray. Seeds expand significantly when wet, so starting volume matters less than ending coverage.
2. Place seeds in a bowl and cover with three to four times their volume of cool water.
3. Soak for 8–12 hours at room temperature. Do not soak longer than 12–15 hours — seeds left in water past this point begin to ferment, producing an off-smell and reducing germination rates noticeably.
4. Drain and rinse seeds thoroughly under cool running water. They should look visibly swollen and the seed coat may show the beginning of a tiny white root tip. This is called the chit stage and confirms germination is underway.
5. Allow seeds to drain in a colander for 30–60 minutes before sowing. Excess surface water on seeds encourages mold during the blackout phase.

If seeds show no signs of swelling after 8 hours, the batch may be old or from a treated lot. Purchase fresh seeds from a reliable sprouting or wheatgrass supplier for your next attempt.

Step 3: Prepare your tray and growing medium

1. Set up the two-tray system. Place the perforated tray inside the solid tray. This configuration lets you water from the bottom after the blackout phase ends, keeping the growing surface and grass blades dry — the single most effective practice for preventing mold.

2. Add growing medium. Fill the perforated tray to a depth of exactly 1 inch of potting mix or coco coir. Level the surface with your hand or a flat card. One inch is shallower than it seems, but wheatgrass is shallow-rooted and harvested young — more depth adds weight without benefit.

3. Firm the surface evenly. Press the medium down gently so it sits uniformly level across the entire tray. An even surface ensures consistent seed contact and prevents uneven germination.

4. Pre-moisten the medium. Use a spray bottle to wet the surface thoroughly until the medium is damp throughout, like a well-wrung sponge. No water should pool on the surface. Tip the tray and confirm excess water drains freely into the bottom tray, then pour off that water before adding seeds.

Step 4: Sow seeds densely and start the blackout phase

Wheatgrass is sown at far higher density than any other indoor growing project. The goal is a continuous single-layer carpet of seeds across the entire tray surface, with seeds touching each other but not piling up in double or triple layers.

1. Scatter pre-soaked seeds evenly across the entire tray surface. Work in small batches from one end to the other to build an even carpet rather than dumping seeds in the center and spreading.
2. Press seeds firmly and evenly into the growing medium using the flat of your palm or an empty tray pressed down over the seeds. Firm, consistent seed-to-medium contact is the single biggest factor in achieving uniform germination across the full tray.
3. Mist the seed surface lightly one more time.
4. Cover the tray immediately with an inverted empty tray, a sheet of black plastic, or a piece of cardboard cut to size. Darkness and slight humidity retention during this phase are both important.

The blackout phase lasts 3–5 days depending on room temperature and seed variety:

• In warm rooms (70–75°F): 3–4 days
• In cooler rooms (60–65°F): 4–5 days
• General rule: keep covered until most seeds have sprouted and stems are actively pushing the cover upward

Check the tray once daily by lifting one corner of the cover. If the medium surface looks dry, mist lightly and replace the cover. If you see heavy condensation collecting under the cover, prop it open briefly for 15–20 minutes to vent excess moisture before resealing — this prevents mold from establishing before the light phase begins.

Skipping or shortening the blackout phase produces shorter, stubbier grass with stiffer stems. The few days of darkness are worth the minimal effort.

Step 5: Move to light and switch to bottom-watering

When most seeds have germinated and the grass is visibly pushing upward against the cover — typically day 4 or 5 — remove the blackout cover and move the tray immediately to your light source.

From this point forward, use only bottom-watering:

1. Pour about half an inch of water into the solid bottom tray.
2. Allow the growing medium to absorb water upward through the drainage holes over 20–30 minutes.
3. Drain any water remaining in the bottom tray after 30 minutes. Never leave the perforated tray sitting in standing water.
4. Repeat once or twice daily depending on how quickly the medium dries out in your environment. In warm or dry rooms, daily bottom-watering may be needed. In cooler rooms, every other day is often sufficient.

Keeping water off the grass blades is the single most effective way to prevent mold, which is the most common failure point in wheatgrass growing. Surface moisture on densely planted stems in a warm room creates ideal mold conditions within hours. Bottom-watering eliminates that moisture source entirely.

Light setup: Position your grow light 2–4 inches above the grass canopy and run it 12–14 hours daily. As the grass grows taller, raise the light to maintain the 2–4 inch gap. A basic outlet timer handles the schedule automatically at a cost of around $10–12: view outlet timers on Amazon.

If using a windowsill rather than a grow light, rotate the tray 180 degrees each day so all sides receive equal light and the grass grows straight rather than leaning heavily toward the window.

Step 6: Harvest at 6-8 inches tall

Wheatgrass is ready to harvest between day 7 and day 10, when the grass reaches 6–8 inches in height. Timing within this window matters more than you might expect.

Harvest before the jointing stage. The jointing stage is when the grass begins to send up a secondary shoot — visible as a second blade emerging from the center of the original leaf. Once jointing begins, the grass rapidly becomes more fibrous, flavor sharpens significantly, and nutritional density declines as the plant redirects energy toward reproductive growth. Watch the base of the tray daily once the grass reaches 5 inches. Harvest immediately when you see secondary shoots forming.

Visual signs of harvest readiness:

• Height of 6–8 inches from the medium surface
• Deep, vivid green color throughout the canopy
• Blades are still soft and pliable when bent, not stiff or fibrous
• No secondary shoots forming at the base of the blades

How to harvest:

1. Hold a small bundle of grass with one hand.
2. Cut cleanly just above the surface of the growing medium with sharp scissors or a serrated kitchen knife.
3. Work across the tray in sections. A full 10x20-inch tray typically yields 8–12 ounces of juice when processed through a masticating juicer.
4. Juice immediately after harvesting for maximum freshness — wheatgrass oxidizes rapidly after cutting and flavor deteriorates noticeably within 20–30 minutes.
5. Unused harvested grass can be stored dry in a sealed bag in the refrigerator for 24–48 hours, though quality declines compared to immediate juicing.

Does wheatgrass regrow after harvest? Technically, yes — a smaller second flush often appears within 7–10 days of the first cut. However, yield is significantly lower, flavor tends to be sharper, and the growing medium becomes depleted. Most growers treat each tray as a single harvest and compost the root mat after cutting, then replant with fresh seeds for a cleaner, more predictable result.

Step 7: Juicing wheatgrass effectively

Wheatgrass fibers are too tough for standard centrifugal juicers — the spinning basket cannot break down the fibrous cell walls efficiently, and most of the juice content remains in the discarded pulp. You need one of these options:

Masticating (cold press) juicer: The most efficient option for regular home use. A slow-turning auger crushes and presses grass fibers, extracting two to three times more juice per ounce of grass than any other method. Masticating juicers also double as general vegetable and fruit juicers: view masticating juicers on Amazon. Budget models start around $70–100; higher-end models run $150–300.

Manual hand-crank wheatgrass juicer: The lowest-cost dedicated option, typically $30–50. Slower than electric but surprisingly effective, and no electricity required. Good for one to two shots daily without the need for a full electric appliance: view manual wheatgrass juicers on Amazon.

High-speed blender with straining: Possible but least efficient. Blend a small handful of cut wheatgrass with 4 ounces of water on high speed for 30–45 seconds, then strain through a fine mesh strainer or nut milk bag, pressing firmly to extract all liquid. This extracts noticeably less juice than a masticating juicer and requires more cleanup, but works as a temporary solution.

Standard use: A 1–2 ounce shot of freshly juiced wheatgrass taken in the morning is the typical consumption pattern. The flavor is grassy and slightly sweet when harvested at the right stage. Mix with a small amount of apple or ginger juice to soften the flavor if the pure shot is too intense at first.

Troubleshooting common wheatgrass problems

Mold growing on the surface or at the base of stems — almost always caused by top-watering during the light phase, insufficient airflow, or seeds sown in overlapping layers. Switch to bottom-watering exclusively after the blackout phase ends. Position a small fan nearby to increase air circulation around the tray. Use fresh growing medium for the next planting.

Seeds not sprouting after 3–4 days — seeds may be old, treated, or from a low-quality batch. Verify that your seeds are untreated sprouting or wheatgrass wheat berries, not flour wheat. Also confirm room temperature is at least 60°F — germination slows significantly below this threshold. Seeds will eventually germinate at 55–60°F but may take 7–8 days to emerge rather than 3–4.

Uneven germination across the tray — usually caused by inconsistent seed pressing during planting or uneven moisture distribution in the growing medium. Press seeds firmly and uniformly during sowing, and pre-moisten the medium thoroughly and evenly before adding seeds. Patches of dry medium create dead zones where seeds fail to germinate.

Yellowing or pale grass after removing the blackout cover — completely normal during the first 24–48 hours as chlorophyll production begins in response to light. Stems green up rapidly once light exposure begins. If yellowing persists past 48 hours under a grow light, increase daily light hours to 14–16 or move the light closer to the canopy.

Grass grows short and stubby with poor yield — usually caused by skipping or shortening the blackout phase, insufficient light intensity after emergence, or room temperatures below 60°F. Ensure a full 3–5 days of darkness during germination and 12–14 hours of bright light daily during the growth phase.

Bitter or sharp juice flavor — almost always means the grass was harvested past the jointing stage. The ideal harvest window closes quickly once secondary shoots appear. In your next grow, watch the base of the tray daily starting on day 6 and harvest the moment secondary shoots begin forming, even if the grass seems short.

FAQ

Bottom line

Growing wheatgrass indoors is one of the most cost-effective indoor growing projects available. A single 10x20-inch tray costs $1–2 in seeds and growing medium and produces 8–12 ounces of fresh juice — a week of daily shots at a fraction of the price of commercial alternatives.

The key practices that determine success: pre-soak seeds for 8–12 hours, press them firmly into the medium at high density, commit to the full blackout phase, switch to bottom-watering exclusively after day 4, and harvest before the jointing stage. Follow those five steps and a consistent, high-quality harvest is straightforward.

For more indoor growing projects, see the how to grow microgreens guide, how to grow sprouts indoors, best grow lights, and best indoor grow kits for beginners.