Houseplant tool
Houseplant Watering Frequency Calculator
Learn guide
This calculator is a lookup table: species + light + pot material → a starting interval. Always confirm with pot weight. No app beats your hands.
- Lookup table
- Then lift the pot
- Winter multiplier
- Species first
Quick facts
| Snake / ZZ · bright | Every 3–5 weeks; pot very light |
|---|---|
| Snake / ZZ · low light | Every 5–8 weeks |
| Pothos / monstera · bright | When top ⅓ dry (~7–14 days) |
| Pothos / monstera · dim | Often 14–21 days; watch stretch |
| Peace lily · bright | At first droop (~5–10 days) |
| Terracotta small | Check ~30% sooner than plastic |
| Winter | Multiply interval × 1.5–2 |
| Override | Heavy pot = wait, even if the table says water |
Overview
A watering “calculator” that spits out “every 7 days” without species or light is a gimmick. This page is the opposite: start here, then use weight. Full explanation: how often to water.
If the table says wait and the plant is mushy, you already overshot — signs · root rot. Gnats: gnat guide. Mix changes the math: potting mix.
How to use the table
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Step 1
Identify the plant type
Drought (snake/ZZ), aroid vine (pothos/monstera), or peace lily. Do not average them.
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Step 2
Classify the light
Sharp shadow = bright. Blob / north wall = low. Grow light with a sharp shadow counts as bright.
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Step 3
Start at the table interval, then lift
If the pot is still heavy on “water day,” wait. If it is light early, water.
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Step 4
Apply winter or terracotta modifiers
Winter: longer. Small terracotta: shorter. Large plastic cachepot: longer, and still dump the saucer.
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Step 5
Reset after you change mix or pot size
Chunky mix dries faster. A jump in pot size dries slower. Re-learn weight.
Common problems
Followed the table; snake still rotted
Why: Table is a start. You watered a heavy pot.
Fix: Weight wins. Gritty mix.
Peace lily droops before the table day
Why: Bright room + terracotta + small pot.
Fix: Water at first droop; table is not a prison.
Pothos fine; monstera yellow
Why: Same room ≠ same root ball size.
Fix: Meter each pot. Monstera care.
Calculator vs moisture meter?
Why: Use both. Table = prior. Meter + weight = today.
Fix: If they disagree, trust weight + wet meter.
Jump to species care
- Snake · ZZ — drought math.
- Pothos · Monstera — aroid math.
- Peace lily — droop math.
- Low-light shelf · urban jungle — room math.
Gear for this species
How often to water houseplants — The calculator gives a prior; your hands give the answer
FAQ
Is this a real calculator widget?
It is a lookup table on purpose. Widgets that ignore species create rot. Lift the pot.
Can I water everything on the same day?
Only if every pot is light. They almost never are.
Does a grow light change the number?
Yes — usually shorter intervals. Re-check weight after a week on the lamp.
What if my plant is not on this list?
Group it: drought succulent-type, aroid vine, or moisture-loving tropical. Then still use weight.
Why winter × 1.5–2?
Less light + slower growth = slower use. Overwatering peaks in winter.
Meter reading vs table conflict?
Trust the wet meter + heavy pot. The table lost.
Aqua Plants Hub Editorial
