Plant SOS · Watering
How to properly water your indoor plants?
The complete guide
Watering is the simplest and most misunderstood task in indoor plant care. Too much water kills more plants than drought — that's a fact. However, there's no universal rule: the correct frequency depends on the species, season, pot size, substrate, and light exposure. This guide provides a clear method so you'll never have to wonder again.
By applying the principles in this guide, you'll avoid the two most common mistakes — overwatering and watering without checking the soil condition — and you'll see your plants thrive naturally.
The Golden Rule — the finger test
Before each watering, ask this simple question: is the soil still moist? Stick your finger 2-3 cm into the substrate. If the soil is still cool or damp to the touch, wait. If it's dry, water.
This rule replaces any calendar. It automatically adapts to the season, your apartment's temperature, and your plant's growth rhythm. It is the only truly reliable indicator.
"The question isn't 'when to water?'
It's 'is the soil dry?'"
From above or from below?
Both methods have their advantages. The ideal is to alternate them depending on the situation.
Top watering
This is the most common method. Pour water slowly in circles around the base of the plant — not on the leaves — until it drains through the drainage holes. Empty the saucer 30 minutes later.
Ideal for: most tropical plants, daily maintenance, rinsing the substrate to remove excess mineral salts.
Bottom watering — soaking
Place the pot in a tray filled with water (up to half its height) and let it soak for 20 to 30 minutes. The substrate absorbs water by capillary action, from bottom to top. Remove the pot, let excess water drain, then put it back in place.
Ideal for: very dry or hydrophobic substrates, plants sensitive to water on leaves (African violet, calathea), orchids, emergency rehydration.
How often depending on the plant?
These frequencies are guidelines — always adapt them to your environment. A warm, dry apartment requires more frequent watering than a cool, humid one.
| Plant | Summer | Winter | Key rule |
|---|---|---|---|
| Monstera, Pothos, Philodendron | 1× / week | 1× / 2-3 weeks | Let the top third of the substrate dry out |
| Ficus, Dracaena, Schefflera | 1× / week | 1× / 2 weeks | Sensitive to variations — regularity above all |
| Calathea, Ferns, Fittonia | 2× / week | 1× / week | Like constant humidity, never dry |
| Cactus & Succulents | 1× / 2-3 weeks | 1× / month or less | Soil completely dry between waterings |
| Orchids | 1× / 10 days | 1× / 3 weeks | Soak 10 min, drain completely |
| Aloe vera, Agave | 1× / 2 weeks | 1× / month | Roots very sensitive to excess water |
| Zamioculcas, Sansevieria | 1× / 2-3 weeks | 1× / month | Among the most drought-resistant |
| Alocasia, Caladium | 2× / week | 1× / week | Soil slightly moist constantly |
Watering according to the seasons
Season is the most underestimated factor in watering. The same plant in the same pot may need twice as much water in summer as in winter.
Spring & Summer — active season
Growth is active, light is high, temperatures rise. The substrate dries out faster. Gradually increase frequency starting in March. This is also the ideal time to fertilize every 2 to 3 weeks.
Autumn & Winter — dormant period
Most tropical plants enter partial dormancy. Growth slows or stops, the plant consumes much less water. Reduce watering by 50 to 70% compared to summer. Stop fertilizing completely. Don't worry if the soil stays dry longer — it's normal.
⚠ The winter trap
In winter, heating dries the air but not necessarily the soil. Many gardeners water more because the plant "looks thirsty" (curling leaves) even though the soil is still moist. Always check the soil before watering, especially in winter.
Which water to use?
Tap water is suitable for most plants, but some species are sensitive to it — especially those that dislike lime and fluoride.
Tap water
Acceptable for the majority of plants. If your water is very hard, let it sit for 24 hours in an open container for the chlorine to evaporate. For sensitive plants (calathea, dracaena), use filtered water.
Rainwater — ideal
Rainwater is soft, slightly acidic, and free of lime and chlorine. It's preferred by tropical plants. If you have a balcony or garden, collect it — your plants will thank you with shinier foliage and faster growth.
Water temperature
Always water with room temperature water. Cold water directly from the tap can cause thermal shock in tropical plants — leaf spots, slowed growth. Prepare your watering can in advance and let it sit at room temperature.
Drainage — essential
No plant can thrive without effective drainage. Stagnant water at the bottom of the pot suffocates roots within a few days. Two conditions are absolutely necessary.
The 6 most frequent mistakes
❌ Watering on a fixed schedule
Every Monday, every 7 days — it doesn't work. The condition of the soil always takes precedence over the date.
❌ Watering in small amounts
A little water on the surface does not reach the roots. Water thoroughly, until drainage occurs.
❌ Leaving water in the saucer
Even 24 hours of standing water can be enough to start rot. Always empty it.
❌ Watering as much in winter as in summer
The plant is dormant and absorbs much less water. Reduce by half in autumn-winter.
❌ Using cold water
Thermal shock stresses tropical plants. Room temperature water only.
❌ Pot without drainage
This is the number 1 cause of mortality. Every pot must have at least one drainage hole.
Signs you're watering incorrectly
Your plant is constantly communicating with you. Here's how to decipher its signals.
Signs of overwatering
Yellow and soft leaves · Constantly moist soil · Musty smell · Fungus gnats around the pot · Soft stems at the base · White mold on the substrate surface.
Signs of underwatering
Curling leaves · Very dry and light soil · Soil pulling away from the edges · Dry or slightly crispy leaves · Very light pot to lift.
💧 Our watering tools
Watering cans & sprayers
- 🚿 Zinc Indoor Watering Can 1L – Long and precise spout
- 🚿 Dark Green 2-in-1 Watering Can & Sprayer
- 💧 Drip irrigator – set of 2
- 💦 Green Glass Mister
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We write practical guides to help enthusiasts care for their indoor plants. · sosplantes@douceurmaison.fr