The best plant care apps, split by where your plants live

A houseplant lives in a stable room. The pot dries at roughly the same rate each week, the light comes from the same window, and a fixed-interval reminder is close to right. That is why the polished houseplant apps are built around schedules, light readings and a photo of each plant, and why they are good at it.

An outdoor plant lives in weather. It rained hard on Tuesday, so the Thursday reminder is wrong. A frost is coming, so the task list should change. The plant is in zone 8a, and that decided what you could plant in the first place. A schedule that ignores the sky will nag you to water a soaked bed and stay quiet when the first cold night arrives.

So the honest ranking is two rankings. Most "best plant care app" lists stretch a houseplant app over the garden and call it done. We would rather tell you which app was built for which side of the door, and admit where our own app does not belong.

Sow does, in the US. Its care tasks are weather-aware: they use US forecasts, so the watering and protection tasks for an outdoor bed move with the forecast rather than running on a fixed interval.

Zone matching covers the US, Canada, the UK and Australia, but the forecast-driven part is US-only; a gardener in Manchester or Melbourne gets the zone-matched plant data and the care content, not the forecast adjustment. We say this on every page because it is the single biggest limit in Sow's care story.

• What we could not confirm

  Whether any other app on this page uses live weather. Planta's entry in our fact file lists "no design, zone, or outdoor weather model" among its weaknesses, and the scope of its outdoor plant support is on our verify list. PictureThis attaches care to identification and that care is described as generic. If one of them has added forecast-based care, we would like to hear about it and re-test.

• What we also did not do

  Time or score Sow's own care engine. The hands-on work behind this page was the garden design bake-off, so the care claim rests on the feature as shipped and documented, not on a measured test. We say so rather than imply otherwise.

Yes, and the useful question is what the reminder is based on. There are two models on this page. The schedule model, which Planta is built around, sets an interval per plant and refines it with inputs you give it, including a light meter reading for the room; it is the right model for a pot that lives indoors, because nothing outside the room changes the answer.

The forecast model, which Sow uses for outdoor plants in the US, starts from the plant's own needs and then moves the task with the weather, so a wet week and a dry week do not produce the same list.

Neither model was tested by us against a real watering can. We can tell you what each app says it does and what our fact file records; we cannot tell you which one kept a fern alive longer, and we would distrust a page that claims to without describing the test.

PictureThis sits outside both models. Its care arrives with the identification and is described in our notes as generic, which is fine for a first read on a plant you have just named and thin as a schedule. Gardenize and Vera are records tools first.

Planta, on the evidence we hold. Its strengths are excellent watering schedules, a light meter and a beginner-friendly design; its site says it is used by over 7M plant lovers. It runs on iPhone and Android, not in a browser. It is free with limits, and the Premium price is shown in the app only, which is why our pricing table says "price in app" rather than a number.

Greg is the other houseplant name people reach for, usually as a Planta alternative. It is a houseplant care app with watering reminders; check its store page for the current free tier and trial terms.

Sow is not a houseplant app. If your collection is a windowsill and a shelf, stop reading our entry and use Planta or Greg. Many people run one app for the house and another for the garden; that is a sensible split, not a failure of either app.

• From Planta's own positioning

  It is houseplant first, and it has no hardiness-zone data and no outdoor weather model. Its pages do not describe how far its outdoor plant support goes.

• What that means in practice

  If you add a rose in a border to Planta, you may get a schedule, but the app will not know your zone or your forecast. For a few patio pots that behave like big houseplants, that may be fine. For beds and borders, it is the wrong model, and that is the gap Sow was built for.

The old "Sow vs Planta" framing still holds and we have folded it in here: windowsill and shelf plants, Planta; yard, beds and borders, Sow. No houseplant app designs a landscape, and Sow does not do houseplants.

Sow. Every plant in its 12,000-plant catalogue carries zone, sun, mature size, bloom and care data, each saved space carries its own sun and zone, and the care that follows planting is weather-aware in the US. It is also the only app here that designs the garden the plants go in.

When something looks wrong, Plant Doctor diagnoses it from a photo, and the Sunlight Meter measures how much sun a spot really gets before you plant.

On our test front garden, the iPhone app returned five named species with botanical names and quantities for part sun (The Fairy Rose x8, Foxglove Sugar Plum x28, Hawera Daffodil x66, Anemone x14, plus one more), and tapping a species shows Remove, Fewer, More and Swap.

On mobile, every generated species can be removed, counted up or down, or swapped, and the Plant Editor lets you drag in plants, furniture, lighting and paving by hand, on a generated design or a plain photo; on the web, Design Studio places plants and objects over the render.

Planting Plans then adds beds found on the satellite view with a priced schedule; our test plan listed 602 plants at an estimated $8,919.70, with quantity and an editable unit price per species, per bed.

The honest limits. Outdoor plants only; weather-aware care is US-only; no AR, no 3D walkthrough, no hardscape CAD; the web design "Shopping List" PDF prices each species at the lowest listed nursery price (often the smallest pot) and does not show mature size or spacing. Free to start; Pro from $39.99 a year on the web ($59.99 a year through the App Store); Pro+ $99.99 a year. Prices checked October 2026. The only proof points we quote: 12,000+ plants, 95,000+ designs, 40,000+ gardeners.

PictureThis, with caveats. It is the best-known identifier, with a reputation for accuracy, disease diagnosis and a huge species database including houseplants, and care advice comes attached to every ID.

In our fact file that care is described as generic, and the top complaint is the auto-renewing trial: $39.99 a year after 7 days, with a $1.99 first-month offer, from the paywall we captured on 2026-08-25. We could not confirm its current web pricing.

Sow identifies outdoor plants too, Plant Doctor diagnoses a struggling one from a photo, and both lead into zone data, design and care. If identification is your main use, our PictureThis alternatives page is the better read, and it includes the free options.

Gardenize, by reputation, for people who want a journal of what was planted where and when, and Vera for simple logging without much else around it. We list them because a records app is sometimes the right answer when a reminder app is not.

If your garden is small and stable, a calendar and a notes app may be all you need. We would rather say that than sell you a subscription you will mute in a month.

The table covers Sow, Planta and PictureThis. Greg, Gardenize and Vera are left out because we hold no verified data on them. Tap or hover any cell for the note behind it.

Read it by job. All three rows have care after planting and identification by camera. Only Sow checks a hardiness zone in full, carries mature size, designs from a photo, builds a planting plan and shows live nursery prices, and only Sow is outdoor-only. Planta is the only one of the three with no browser version at all.

Prices checked October 2026, except PictureThis, which was captured in-app on 2026-08-25. Planta's Premium is not published on its site, so the table says "price in app". Sow's App Store annual price is higher than the web price; the account is the same on both.

Every app in the table runs a free tier of some kind; what matters is what the free tier gives. Sow's is 10 free designs to start and more for taking part (posting a design earns 25 credits, a referral 100), with a watermark. Planta's is "free with limits". PictureThis gives free identifications with limits and a 7-day trial that converts to $39.99 a year unless you cancel.

For a shelf of houseplants that you keep losing to overwatering, Planta's schedule is the kind of thing people pay for without regret, and we would not argue with them.

For a garden, the paid value is different: not the reminder itself but the plant data behind it (will it survive here, how big will it get) and the design and planting plan that sit upstream of the care.

That is what Sow Pro is for, and it is also why Sow is not worth paying for if your plants are indoors.

Whichever side you are on, read the trial terms before you tap Start. A store subscription keeps running until you cancel it in the store's subscription settings; deleting the app does not stop it.