Hardest to kill
Snake Plant (Dracaena trifasciata)
Someone who has killed everything else
- Score
- 9.2 / 10
- Price
- Check price
Spec sheet for keeping plants alive
You are not bad at plants. You are bad at remembering.
Honest picks for people who keep killing houseplants: published reservoir capacities, refill intervals we show the arithmetic for, and no pretend test lab.
Every duration on this site is a division problem. Reservoir capacity, divided by what one thorough watering of your pot actually takes, multiplied by a watering cadence published by a university extension service. We show the working, and where a manufacturer does not publish the number, we say so instead of estimating it.
- Products tracked
- 30
- Sourced spec figures
- 116
- Capacities we verified
- 10
- Pages published
- 49
The number that is missing from this band is the interesting one: 7 of the 30 products here have at least one central specification their maker does not publish at all. Where that number is the reservoir capacity, we cannot compute a refill interval, and we say so on the card rather than estimating one.
What won each comparison
Every category winner, in one place
The top pick from each of our roundups, with the price and a buy link right here rather than three clicks deep.
Best watering spike
Plant Nanny Terracotta Wine Bottle Stakes
A one-to-two week trip, on medium indoor pots
- Score
- 9.1 / 10
- Price
- Check price
Best outdoor planter
EarthBox Original
Tomatoes, peppers and herbs on a patio or balcony
- Score
- 9.0 / 10
- Price
- Check price
Best built-in reservoir
ZZ Plant (Zamioculcas zamiifolia)
A dark office or a hallway with no natural light
- Score
- 9.0 / 10
- Price
- Check price
Best indoor planter
Lechuza Classico Color 21
A desk or shelf plant you want to stop thinking about
- Score
- 8.8 / 10
- Price
- Check price
Best for a week away
Plant Nanny Watering Spikes with Bottle Adapter
The longest unattended stretch you can get without a pump
- Score
- 8.7 / 10
- Price
- Check price
Best indoor meter
XLUX T10 Soil Moisture Meter
Anyone who has killed a plant by watering on a schedule
- Score
- 8.7 / 10
- Price
- Check price
Best conversion kit
Gardener's Supply Adjustable Self-Watering Insert
Turning a planter you already own and like into a self-watering one
- Score
- 8.6 / 10
- Price
- Check price
Best large planter
Lechuza Cubico Color 22
A floor plant in a corner you would rather not water weekly
- Score
- 8.4 / 10
- Price
- Check price
Start from your problem
Five ways plants die, and what fixes each
Pick the sentence that sounds like you. Each section is a real destination with its own roundups, comparisons and guides.
I want a pot that does it for me
Self-Watering Planters
A reservoir under the soil is the most durable fix for forgetting. How long one actually lasts is a division problem, and almost nobody publishes the numerator.
I am leaving on Friday
Vacation Watering
The right answer depends entirely on how long you are gone and how big your pots are. Both of those are numbers, which makes this a numbers problem.
I want the cheap fix
Watering Globes and Spikes
The cheapest fix in the category, and the one with the widest gap between what is advertised and what the volume can support.
I want to stop guessing
Moisture Meters
Watering on a schedule is what kills plants. A meter replaces the schedule with a reading, and that swap is the whole trick.
My plant is dying right now
Plant Rescue
Overwatering and underwatering look almost identical from above the soil. Start here, work out which one you have, and then fix it.
Read this first
How we work out a refill interval
The pot-size table, the assumption we had to make, the published cadence bands we multiply by, and the limits of all of it. Everything you would need to check our numbers or substitute your own.
Claims we do not make
- Units we claim to have tested
- 0
- Sponsored placements
- 0
- Free products accepted
- 0
- Prices we made up
- 0
Everyone in this category says they tested twenty planters. We have not tested any, and we say so.
What we did instead: compiled the published reservoir capacity of every product here, worked out how many normal waterings that actually holds, and multiplied it by the watering cadence a university extension service publishes. You can check the arithmetic yourself.
It is all on the methodology page, including the pot-size table and the assumption we had to make.
Why this site is different
What we do instead of testing
Four things we can honestly do without a lab, in a category where nine of nine competitors we checked publish no capacity, no refill interval and no price.
Published specs only
Every figure is attributed
Each spec row on this site carries the publisher it came from. Where a maker does not publish a figure, the row says so and stays empty.
Shown arithmetic
You can check the math
Every refill interval shows its division and names the pot size and plant type it assumes. Substitute your own numbers and get your own answer.
A skip in every roundup
At least one thing we tell you not to buy
A roundup where every product wins is an advertisement. Every product page here also carries a who-should-skip-this section.
Cited horticulture
Extension services, not other blogs
Watering cadences, overwatering symptoms and root-rot causes are cited to university extension publications and the RHS, linked at the point of claim.
Read these first
The four pages that carry the argument
If you only read a few things here, read these. Two of them will probably talk you out of a purchase.
Guide
Do Watering Globes Actually Work?
The quantified answer, with the arithmetic and the one published first-hand account.
Guide
Overwatered vs Underwatered: How to Tell
The symptom table, the four checks that separate them, and what to do for each.
Methodology
How we work out refill intervals
The pot-size table, the assumption behind it, and the published cadence bands. Written so you can disagree with it precisely.
Guide
Are Self-Watering Pots Worth It?
The honest yes-or-no, including the three readers who should not buy one.
Latest
Recently published
Newest first. Every page on the site is also listed on the sitemap page linked in the footer.
- Are Soil Moisture Meters Accurate?What the number actually is, the three things that skew it, and why they still help.
- Analog vs Digital Soil Moisture MetersSame sensor, different display - and why the decimal place is false precision.
- Are Self-Watering Pots Worth It?The honest yes-or-no, including the three readers who should not buy one.
- Best Automatic Plant Watering SystemsPumped drip kits compared on published reservoir, timer range and failure risk.
- Before You Leave: Cutting the Water DemandThe free demand-cutting measures, and how to brief a plant sitter properly.
- Best Watering Globes for Indoor PlantsGlobes ranked by capacity, with the arithmetic on which sizes can and cannot work.
- Best Plant Watering Spikes and StakesTerracotta spikes and ceramic cones ranked on capacity and published flow rate.
- Bottom Watering: How Often and How LongHow long to soak, how often, and the salt build-up that means you still need to top-water sometimes.
- Cheap Soil Moisture Meters: What Price Actually BuysWhat price genuinely changes in this category, which is less than you would expect.
- Best Self-Watering Inserts for Pots You Already OwnConversion inserts ranked on published capacity and the pot depth each one needs.
How this is funded
We earn a commission. Here is exactly how.
Wilt & Water is a participant in the Amazon Services LLC Associates Program. If you buy something through a link here, we earn a commission from the retailer. It does not change what you pay, and it does not change what we recommend: selection is driven by published specifications and the computed refill interval, never by commission rate or by which programs we happen to have joined.
We are not currently in any other affiliate network, so every buy link on this site goes to Amazon. When that changes we will say so here rather than quietly.