Growing your own seeds in a Gardyn with Seedless yCubes
Yes, you can grow your own seeds in a Gardyn. Seedless yCubes are the Gardyn product made for it: the same rockwool starter as a regular yCube, with no seeds inside, so you can add a variety Gardyn doesn’t carry. They work best for compact, fast-maturing plants, while pre-seeded yCubes remain the tested, easiest route for everything in the Gardyn catalog.
Key takeaways
- Seedless yCubes are Gardyn’s way to add varieties outside the catalog, and they slot into the columns just like pre-seeded yCubes.
- For plants Gardyn already sells, pre-seeded yCubes come tested, labeled for Kelby and backed by a sprout guarantee.
- Good candidates mature in a reasonable time, stay compact and are long-day or day-neutral. Trees, woody shrubs, vines and root crops are poor fits.
- Germinate with water only, around 70°F and 65 to 75% humidity, with 14 to 16 hours of Boost light. If your tank already has plant food, start seeds in the Sprout Nursery.
- A membership isn’t required to grow your own seeds. Without one you still set light and water schedules in the app.
What is a Seedless yCube, and when should you use one?
A Seedless yCube is an empty yCube you fill with seeds of your choice, sold on the Seedless yCube product page and in the shop in the Gardyn app. Inside is rockwool, an inert mineral made from basalt rock that gives seeds a medium to germinate and develop roots.
Use Seedless yCubes for a variety Gardyn doesn’t sell, such as a specific heirloom, a regional favorite or a flower you can’t find in the catalog, or for a Gardyn plant that is temporarily out of rotation. For anything Gardyn already carries, the pre-seeded yCube is the better pick: Gardyn’s Plant Health and Nutrition team tests each variety for taste, appearance and ease of growing in the system.
The table below shows how the two options differ day to day.
| Feature | Pre-seeded yCube | Seedless yCube |
|---|---|---|
| Best for | Any variety in the Gardyn catalog | Varieties Gardyn doesn’t carry |
| Seeds | Untreated, non-GMO seeds, intentionally overseeded | You choose and add the seeds |
| Variety testing | Tested by Gardyn for the system | Your choice, guided by Gardyn’s seed selection rules |
| Label and dot code | Plant name plus a 4- or 5-circle code that helps Kelby identify the plant | No label or code |
| Plant Book page | Days to sprout and maturity, thinning, light zone and care level | Use the seed packet and Gardyn’s general guidance |
Why pre-seeded yCubes stay the default
Pre-seeded yCubes take the guesswork out of variety selection. Each one is overseeded so you get a full stand after thinning, carries a code Kelby can read, and links to a Plant Book page with its light zone and timing. Pre-seeded yCubes are also backed by Gardyn’s sprout guarantee: if a yCube doesn’t sprout, Gardyn replaces it. Gardyn adds new varieties regularly, so check the catalog before you buy seed packets.
Which seeds grow well in a Seedless yCube?
The best seeds for a Seedless yCube are compact plants that mature in a reasonable time, have modest roots and flower under long days or regardless of day length. Gardyn’s core checks are covered in the help center article How to Choose Your Own Seeds for Seedless yCubes:
- Pick plants that mature in a reasonable time, not trees or vines.
- Skip root crops such as garlic, onions and potatoes, and plants with large, strong roots that can crack the yCube or overgrow the slot and column.
- Favor determinate varieties, which stop growing at a set size, and for fruiting plants, varieties with smaller fruit.
- Choose long-day or day-neutral varieties.
- Check whether the seeds need special preparation, such as soaking or chilling, to germinate.
The same article adds three practical checks: make sure the variety suits your home’s temperature and humidity, since some tropical plants struggle indoors; consider whether it is sensitive to standard plant food levels; and confirm whether any part of the plant is toxic if you have children or pets.
Why day length matters
A Gardyn runs its lights 14 to 16 hours a day, so day length decides whether a plant will flower. Long-day plants flower above about 14 to 16 hours of light, and day-neutral plants flower regardless. Short-day plants flower below about 12 to 14 hours, and ambient light in a home can disrupt them, so they suit only a grow tent or room with no other light.
On a seed packet, words like dwarf, patio, bush and determinate usually point to a plant that stays within a slot, the same traits that suit a balcony container.
Can you grow spinach, habaneros, tomatoes or berries from your own seeds?
Compact peppers, determinate tomatoes and leafy greens are good fits for your own seeds, while berries, artichokes and root crops are not. The table below sorts the crops owners ask about most, based on Gardyn’s seed selection rules.
| Crop | Fit | What to know |
|---|---|---|
| Spinach | Good | Start with Gardyn’s Perpetual Spinach yCubes, a Beginner plant that prefers 60 to 70°F. For a different spinach, choose a variety described as slow to bolt. |
| Habanero and other hot peppers | Good | Pick a compact variety and give it a center high-light slot. |
| Roma and other paste tomatoes | Good with a determinate variety | Many Roma types are determinate. Plan for pruning, hand pollination and support. |
| Large slicing tomatoes | Possible, harder | Indeterminate vines and big fruit strain the column. Smaller-fruited, determinate types do better. |
| Raspberries, blackberries and blueberries | Poor | Woody, long-lived shrubs and canes with large root systems. |
| Artichokes | Poor | A large perennial that takes a long time to mature. |
| Garlic, onions and potatoes | Poor | Root crops that Gardyn’s guidance says to avoid. |
Peppers from seed
Habaneros and other peppers grow well from seed, with patience at the start. University of Georgia Extension notes that pepper seeds take about 10 days to germinate, longer than most greens. Once plants flower, they need the Blooming and Fruiting dose of 1 teaspoon of Gardyn Plant Food per gallon and hand pollination. For variety ideas, see growing hot peppers in your Gardyn.
Roma tomatoes and drying lower leaves
Yellowing or drying on a tomato’s oldest, lowest leaves is common as the plant grows, and you can trim those leaves with clean scissors, a little at a time. If leaf tips and edges turn dry or crispy elsewhere, Gardyn’s guidance points to late tank top-offs, plant food that wasn’t measured or dissolved correctly, and low room humidity. A Gardyn Plant Belt helps carry the weight of fruit.
How do you start your own seeds in a Seedless yCube?
You start your own seeds by sowing a few in a Seedless yCube and germinating it with plain water, warmth and light, on an empty Gardyn or in the Gardyn Sprout Nursery. The process in brief:
- Prepare seeds that need it, such as soaking or chilling, following the seed packet.
- Sow a few seeds per yCube, so you have extras in case some don’t sprout.
- Germinate with water only. Plant food inhibits germination, so new yCubes shouldn’t go on a Gardyn that already has plant food in the tank. Use the Nursery instead while the tower keeps producing.
- Keep conditions steady: about 70°F, 65 to 75% humidity and 14 to 16 hours of Boost light a day, without oversaturating the rockwool.
- Move yCubes to the Gardyn once they show true leaves, roots about 0.5 inches long or yellowing cotyledons.
- Thin to the right number of plants, then add yCovers to keep algae off the rockwool.
Cotyledons are a seedling’s first pair of leaves, powered by energy stored in the seed. True leaves are the second set, which look like a small version of the mature leaf. When starting on an empty Gardyn, setting the Start of Watering (SOW) date in the app turns on Germination Mode, an early-life watering schedule designed to improve sprouting. If mature plants are already growing, the help center’s yCube Refill Tips cover starting new yCubes alongside them.
Can you sow fewer seeds to skip thinning?
With Seedless yCubes, you control the seed count, so you can sow just a few and thin less. Keep 1 plant for leafy greens, lettuces, fruiting plants and large flowers, and 3 for herbs and small flowers. Pre-seeded yCubes are intentionally overseeded because some sprouts naturally don’t survive. Rather than pulling extra seedlings, cut them at the base with clean scissors about a week after their first plant food, which avoids disturbing the roots of the plant you keep.
Covering open slots while you wait
If you leave a slot open for a large plant or while seeds germinate in the Nursery, cover it with a Gardyn Cap to keep light and algae out of the column. Caps pop out easily when the yCube is ready.
Can you put garden-center starts or live plants in a Gardyn?
Garden-center starts and potted plants don’t fit a Gardyn, because they grow in soil and the columns are built for yCubes. yCubes contain no soil, so they don’t carry pests in, while pests indoors usually arrive on houseplants, pets or through windows. Long-lived houseplants such as alocasia also fall outside Gardyn’s guidance to grow plants that mature in a reasonable time.
For strawberries, Gardyn offers Mini Strawberries, which come as yCubes and list a first harvest of 3 to 4 months. Gardyn occasionally takes plants out of rotation to keep a dynamic catalog; the Gardyn Plant Portfolio FAQs explain why, and you can let Gardyn support know if there is a plant you would like to see return. Gardyn’s care guidance is to trim strawberry runners as soon as they appear, since they divert energy from fruit. More on the crop is on the strawberry growing page.
Starting seedlings for an outdoor garden
You can start vegetables in your Gardyn and move them outside once soil temperatures stay above 50 to 60°F with no further risk of frost. The help center article Transplanting yCubes Outside covers timing, and owners share results in how to transplant yCubes outdoors.
Can you grow your own seeds without a membership, Kelby or Wi-Fi?
Yes. A membership isn’t required to use a Gardyn, and you can grow your own seeds with or without one. Without a membership, you still use the Gardyn app, set light and water schedules, check the water level and get free replacements for yCubes that don’t sprout. The help center article Growing Successfully Without an Active Membership covers the setup.
Setting schedules yourself
The app has three watering options: Smart Watering, where Kelby manages the schedule, Schedule Mode, where you set your own times, and Manual Mode, where you start each cycle. Lights run on a schedule you set from the light tile, with 14 to 16 Boost hours a day recommended. If your Gardyn loses Wi-Fi, it keeps running on the last light and water schedules it saved, though you can’t adjust them until it reconnects.
Tracking your own seeds in the app
Seedless yCubes come without the plant label and circle code that help Kelby identify pre-seeded yCubes, so keep a simple log of each variety, slot and sow date. Members still get Kelby’s monitoring, such as low water and pest alerts, and can ask questions through Ask Kelby. The Gardyn membership page lists what members get, including monthly yCube credits.
Where to go from here
If you own a Gardyn, order a few Seedless yCubes and test one new variety alongside your pre-seeded plants. If you’re still choosing a system, Gardyn Home holds 30 plants in about 2 sq ft of floor space, and Gardyn Studio 2 holds 16 plants in about 1.4 sq ft. The Gardyn comparison quiz helps you pick.
Frequently asked questions
Do Seedless yCubes replace pre-seeded yCubes?
Seedless yCubes are made for varieties Gardyn doesn’t carry, or a favorite that is temporarily out of rotation. Pre-seeded yCubes remain the best choice for anything in the catalog, since each variety is tested for the system, overseeded for a full stand, coded for Kelby and backed by a sprout guarantee. A simple approach is to grow mostly pre-seeded yCubes and keep a slot or two for experiments.
How many of my own seeds should I put in a Seedless yCube?
Sow a few seeds so you have backups if some don’t germinate, then thin once they establish. The target is 1 plant for leafy greens, lettuces, fruiting plants and large flowers, and 3 for herbs and small flowers. Cut extras at the base with clean scissors instead of pulling them, so the keeper’s roots stay undisturbed.
Why didn’t my own seeds sprout on the Gardyn?
The most common reason is plant food in the tank, which inhibits germination. Start new seeds in the Sprout Nursery with plain water, or on an empty Gardyn in Germination Mode. Also check the seed packet for soaking or chilling needs, keep the room near 70°F, and avoid soaking the rockwool more than needed.
Can I grow flowers from my own seeds?
Yes, as long as the variety stays compact and flowers under long days or regardless of day length. Most flowers are Beginner plants on Gardyn. Large flowers are thinned to 1 plant per yCube and small flowers to 3. Gardyn also sells tested flower varieties if you want a sure start.
Where should I place plants grown from my own seeds?
Match the plant to a light zone. Fruiting plants such as tomatoes, peppers and strawberries go in the center high-light zone so they can flower and fruit. Leafy greens and herbs do well in medium and low light zones toward the outer and lower slots, and they prefer cooler spots than fruiting crops.
Do Seedless yCubes work in both Gardyn Home and Gardyn Studio?
Yes. Seedless yCubes fit both models, since every Gardyn uses the same yCube format. Gardyn Home has 30 slots across 3 columns and Gardyn Studio has 16 across 2, so plan big plants carefully on Studio, where each open slot you leave around a large plant costs more of your total space.