What an indoor garden really costs to run

After you buy it, an indoor garden costs three things to run: electricity, consumables like plant starters and plant food, and an optional membership. Gardyn lists energy use for Gardyn Home 4 at 47 kWh a month; as an example, at the EIA’s 2025 US average residential rate of 17.3 cents per kWh, that works out to about 8 dollars a month. Everything else depends on how many plants you start, how much you grow and whether a membership fits the way you garden.

Key takeaways

• Electricity is predictable: 47 kWh a month for Gardyn Home 4, about 564 kWh a year, or roughly 5% of what an average US home uses.
• The box covers your first grow: lights, columns, tank, pump, a yCube starter set, plant food with a scoop and a power supply.
• Ongoing supplies are short: new yCubes as plants finish, Gardyn Plant Food, and HydroBoost, which lasts about 6 to 8 months per bottle.
• A membership is optional. It adds monthly yCube credits, Kelby’s guidance and premium app features, and its value depends on how many credits you use.
• You don’t need pH, EC or TDS meters, a water line or replacement bulbs, so the list of hidden costs is short.

What does an indoor garden cost each month after you buy it?

A Gardyn’s monthly running cost is electricity plus the plants and supplies you choose to buy, plus a membership if you add one. The table below lists each cost component and how often it comes up.

For current prices on plants, supplies and plans, see the Gardyn membership page and each product page. To compare running costs against what you spend on produce today, the Gardyn savings calculator pulls the pieces together.

How much does an indoor garden add to your electric bill?

A Gardyn Home 4 uses 47 kWh of electricity a month, so the added cost on your bill is 47 multiplied by your electricity rate. A kilowatt-hour (kWh) is the unit your utility bills you in: 1,000 watts of power used for one hour.

As a worked example only, the US Energy Information Administration puts the 2025 average residential electricity price at 17.3 cents per kWh. At that rate, 47 kWh costs about 8.13 dollars a month, or about 98 dollars a year. For context, the EIA reports that the average US residential customer used about 899 kWh per month in 2022, so one Gardyn Home 4 adds roughly 5% to an average home’s usage.

This example table shows how one Gardyn Home 4’s electricity cost changes with the rate on your bill; the 17.3 cent row uses the EIA 2025 average, and the other rows are sample rates for illustration, not a quote.

Does the light schedule change the bill?

Keep the hours steady and move the timing instead: on a time-of-use plan, when the lights run matters more than trimming them. Gardyn recommends 14 to 16 hours of Boost (full-brightness) light a day, and Boost hours should not be swapped for dimmed light. Without enough light, plants can grow leggy, bolt early and turn pale, so cutting light to lower the bill costs you harvest. Bolting means a plant shifts from leaves to flowers and seeds, and its leaves turn bitter.

How do you shift your light cycle around peak electricity rates?

If your utility charges time-of-use rates, you can move your Gardyn’s light schedule in the app so more of its Boost hours fall in cheaper off-peak periods. Time-of-use plans charge more when demand is highest; as the Colorado Public Utilities Commission explains, customers who shift even small amounts of use from on-peak to off-peak hours can save money.

A few things to keep in mind as you plan the shift:

1. Check your bill or utility website for your on-peak hours. They vary by utility and season.
2. Keep the total at 14 to 16 Boost hours a day and change only the start and end times.
3. Overnight light shifts must be split at midnight in the app, so a shift that runs from evening into morning becomes two shifts.
4. Gardyn recommends running lights during the day unless the room stays dark in daylight, like a windowless basement, so an early-morning start is often the easiest compromise.

On a flat-rate plan, time of day doesn’t change your bill, so pick the schedule that fits your sleep.

How much power do two, three or four Gardyns use?

Each Gardyn Home 4 uses 47 kWh a month, so the total scales in a straight line: two use 94 kWh, three use 141 kWh and four use 188 kWh. The table shows a worked example at the EIA’s 2025 US average rate of 17.3 cents per kWh; your cost will follow your own rate.

A classroom Gardyn Home 4 uses the same 47 kWh a month. For members, Vacation Mode, which gives light in short bursts to slow growth and water loss, carries plants at least 30 days old through breaks of 5 to 14 days. Each Gardyn needs its own membership, so plan membership costs per device.

What comes in the box, and what costs extra?

Everything you need to start growing on day one comes in the box; ongoing plants, extra plant food, HydroBoost, a membership and optional accessories are separate.

Included with every Gardyn

• LED light bars with built-in cameras: 2 on Gardyn Home, 1 on Gardyn Studio
• Columns: 3 on Gardyn Home, 2 on Gardyn Studio, with slots for 30 or 16 plants
• A water tank with lid, pump and sensors
• A free yCube starter set chosen for strong first harvests
• A bottle of Gardyn Plant Food with a scoop
• A power supply and a user manual

What you buy later

Plan on three recurring purchases: new yCubes as plants finish, Gardyn Plant Food once the starter bottle runs low, and HydroBoost for weekly tank care. The help center explains where to buy more plant food, and Subscribe & Save can ship essentials on a schedule so you don’t run out.

Which accessories are worth it, and which can wait?

The accessories worth buying early are the inexpensive ones that prevent problems: Gardyn Caps for empty slots and yCovers for the tops of yCubes, both of which block light to keep algae down. Everything else can wait until your plants call for it.

• Worth it early: Gardyn Caps for any slot you leave empty and yCovers once seedlings are thinned. A little algae poses no threat, but in larger amounts over time it can make it hard for new sprouts to compete.
• Worth it once you replant often: the Gardyn Sprout Nursery. Plant food inhibits germination, so the Nursery lets you start up to 10 new yCubes while the tower keeps producing.
• Worth it for fruiting crops: the Gardyn Trellis or Plant Belt for vining and top-heavy plants like peas, cucumbers and tomatoes.

If you garden with filtered, distilled or naturally soft water, Gardyn also recommends a weekly calcium and magnesium supplement; standard tap water needs nothing extra.

Do you really need to test pH, EC and TDS?

No. When you follow the plant food directions, add HydroBoost with weekly top-offs and refresh the tank when Kelby prompts, Gardyn plant food and HydroBoost keep pH and EC balanced across a range of tap waters, so there are no meters or test strips to buy.

pH measures how acidic or basic water is on a scale of 0 to 14. EC, or electrical conductivity, estimates the total dissolved nutrients in the water, and TDS (total dissolved solids) is a related reading. Gardyn’s Hybriponic™ system is designed so you don’t have to manage these numbers.

How often do you need new plants, and what does that cost?

You replace a plant when it reaches the end of its productive life, which for most Gardyn plants means several months of continuous harvests. Herbs and leafy greens eventually bolt, and fruiting plants are done when they go many weeks without new flowers.

Most leafy greens are ready in 3 to 5 weeks, lettuces reach full size in about 3 to 4 weeks, and herbs are ready in 4 to 6 weeks. Fruiting plants such as Cherry Tomatoes take about 60 days to flower and begin fruiting.

You can buy yCubes in the Gardyn app or browse the full plant catalog. Members use monthly credits; non-members buy at standard pricing, with shipping charged per order of up to 10 items. For a sense of how much one plant yields, see how much one plant really produces.

Can you 3D print or make your own yCube alternatives?

Gardyn devices fit only yCubes, so other plant starters won’t work in the columns. If you want to grow from your own seeds, Seedless yCubes are the supported route. Each holds the same rockwool growing medium, ready for your seeds.

Is the membership worth it, and what does it add?

A membership is worth it when you use its monthly credits and want Kelby’s guidance; it is optional, and a Gardyn grows without one. Without a membership you still get the Gardyn app, light and water schedules, water level checks and free replacements for yCubes that don’t sprout.

A membership adds:

• Monthly yCube credits: 10 for Gardyn Home and 5 for Gardyn Studio
• Free shipping on one credit order a month
• Member pricing on extra plants and access to members-only plants
• Kelby’s monitoring, alerts and guidance through the device cameras and sensors
• Premium app features such as Vacation Mode, Ask Kelby and time-lapse videos

Learn more about Kelby on the Meet Kelby page, and see the help center for a full list of membership benefits.

How much does the membership really save?

The value of a membership comes down to how many credits you redeem and how often you would otherwise buy plants at standard pricing. Current plan pricing is on the Gardyn Home membership and Gardyn Studio membership pages, and the savings calculator lets you test your own numbers. Today, Kelby and the premium app features come as part of a membership together with its monthly credits, while the standard app controls stay free for every owner.

How do you tell if you’re using enough credits?

Check your credit balance, shown as the number next to the tokens symbol in the upper status bar of the Gardyn app’s home screen. Unused credits roll over while your membership is active, up to 30 banked credits for Gardyn Home and 16 for Gardyn Studio. If your balance sits at that cap, new credits stop adding up, which is a cue to start more plants. The help center explains how plant credits work.

Two-year plan, one-year plan or month to month?

Choose month to month if you want flexibility, and a prepaid 1-year or 2-year plan if you know you’ll grow steadily. Monthly plans can be paused for 1 to 3 months; 1-year and 2-year plans can’t be paused, so they suit households that replant year-round.

A prepaid membership starts when your Gardyn first connects to Wi-Fi, so no paid time is lost while the box is in transit or waiting for setup. For a family on Gardyn Home, 10 credits a month refills a third of the 30 slots every month, which matches a steady rotation of greens and herbs.

Already on a two-year plan? Keep your balance below the rollover cap, start replacements in the Sprout Nursery and try members-only plants.

Can you keep growing without the membership?

Yes. A Gardyn keeps running on its light and water schedules without a membership, and you buy yCubes, plant food and HydroBoost as you need them. Kelby’s alerts, Vacation Mode, Ask Kelby and monthly credits stop, so you take on more of the watching yourself.

The help center article on growing successfully without an active membership covers what changes and how to adjust your routine.

Gardyn Studio or Gardyn Home for an apartment: power, refills and upkeep?

Gardyn Studio is the smaller commitment on plants and refills: it holds 16 plants on 2 columns in about 1.4 sq ft, runs one light bar instead of two, and grows up to 5 lbs of produce a month for one or two people. Gardyn Home holds 30 plants in about 2 sq ft and grows up to 10 lbs a month, about a daily salad for four.

• Power: Gardyn publishes a monthly figure of 47 kWh for Gardyn Home 4. For Gardyn Studio 2 power use, check the Gardyn Studio 2 product page or ask Gardyn Customer Success.
• Refills: Studio uses smaller doses, for example 1.5 teaspoons of HydroBoost per full tank of standard water compared with 2 teaspoons for Home, so each bottle stretches further.
• Membership: 5 credits a month for Studio, with up to 16 banked, which can replant every slot in about three months.

Both are floor-standing towers with the same app and Kelby features. Still deciding? The Gardyn comparison quiz matches a model to your household.

Is a Gardyn manageable on a fixed income?

Yes, because the running costs are predictable and mostly within your control: electricity stays steady month to month, a membership is optional, and you decide how often to replant. A Gardyn Studio with 16 slots needs fewer new plants to stay full and uses smaller HydroBoost doses than a Gardyn Home.

A gift recipient’s ongoing costs are the same: electricity, plant food, HydroBoost and new plants, plus a membership if the gift didn’t include a prepaid plan. For the time involved, see how much work Gardyn maintenance actually takes.

Does a Gardyn really save money on groceries?

A Gardyn offsets grocery spending in proportion to how much of what it grows you would otherwise buy. Gardyn Home grows up to 10 lbs of produce a month and Gardyn Studio up to 5 lbs, from greens and herbs to fruiting crops.

Whether it pays for itself, and how fast, depends on your local produce prices, what you grow and how much you waste today. Comparing one yCube to a bag of store lettuce misses that a single yCube can be harvested again and again for several months. For a side-by-side breakdown, read Gardyn economics: Gardyn vs. the grocery store.

Money-saving tips from experienced owners

Owners who spend the least per harvest keep every slot productive and every supply measured:

1. Measure plant food every time. More plant food doesn’t mean bigger plants, and too much can burn them.
2. Use HydroBoost weekly. It reduces algae, biofilm and salt deposits, which means fewer whole-device cleanings.
3. Harvest often, from the outside in. Regular harvests keep greens producing longer.
4. Stagger replacements. Start new yCubes in the Sprout Nursery as older plants decline so no slot sits empty.
5. Keep the lights on schedule. The LEDs are rated for 50,000 hours, about 8.5 years at 16 hours a day, so there are no bulbs to replace for years. The help center covers how long the LED lights last.
6. Ask for replacements. yCubes that don’t sprout can be replaced free, member or not.
7. Bank credits wisely. Stay under the rollover cap so no credit goes unused.

Your next step

Start with your electric rate and the 47 kWh figure, then add the plants and supplies you expect to use. Plug your grocery habits into the savings calculator, compare models on the Gardyn Home 4 and Gardyn Studio 2 product pages, and decide whether a membership fits after you see how often you replant.

Frequently asked questions

Do you have to pay a monthly subscription to use a Gardyn?

No subscription is required. A Gardyn runs on its own light and water schedules and works with the free Gardyn app, including water level checks and free replacements for yCubes that don’t sprout. A membership is an optional add-on for monthly yCube credits, Kelby’s monitoring and alerts, members-only plants and premium features such as Vacation Mode and Ask Kelby.

How much will my electric bill go up with a Gardyn Home 4?

Multiply 47 kWh by the rate on your bill. As an example, at the 2025 national average of 17.3 cents per kWh reported by the EIA, that is about 8 dollars a month, or close to 100 dollars a year. Higher local rates raise the number, and lower rates reduce it. The usage stays steady from month to month.

What does a Gardyn cost per year, all in?

Add four lines: about 564 kWh of electricity for Gardyn Home 4 at your local rate, the plants you replace, plant food and HydroBoost, and a membership if you choose one. HydroBoost bottles last about 6 to 8 months. Current prices for each piece are on the product and membership pages, and the savings calculator totals them.

Can I use an HSA or FSA for a Gardyn membership?

Gardyn devices and prepaid memberships may be eligible for HSA/FSA payment through Gardyn’s partner Truemed. You choose the HSA/FSA option at checkout and complete a short health survey. If you are approved, Truemed issues a Letter of Medical Necessity, usually within 2 to 5 hours, and there is no cost to use it.

What does the Gardyn Studio membership include for 16 plants?

A Gardyn Studio membership adds 5 yCube credits a month, which roll over up to 16 banked credits while the membership is active. That is enough to refill every Studio slot. It also includes free shipping on one credit order a month, member pricing, members-only plants, Kelby’s guidance and premium app features.

Do yCubes cost more than store-bought lettuce?

Comparing one yCube to one head of lettuce undercounts the yCube. Most leafy greens are ready to harvest in 3 to 5 weeks, and with regular outside-in harvesting a single plant keeps producing for several months. Your result depends on what you grow and what you pay at the store, so test it in the savings calculator.

Is there a plan with app features and no plant credits?

Today, Kelby’s alerts and the premium app features such as Vacation Mode, Ask Kelby and time-lapses come as part of a membership, together with its monthly yCube credits. Every owner keeps the free app controls without a membership, including light and water schedules and water level checks. Unused credits roll over while the membership is active.