A plant needs water to live, but watering requires a bit of observation. Under-watering dehydrates it, while a potting mix that stays constantly soggy can suffocate its roots. Fortunately, the foliage, the substrate, and even the weight of the pot provide valuable clues. Here’s how to recognize underwatering or overwatering and adopt the right steps to save your plant.
What to remember
- Dry leaves and potting mix that pulls away from the pot often indicate underwatering.
- Soft, yellowing leaves in a moist substrate point more toward overwatering.
- Always check the moisture of the potting mix before watering.
- A pot with drainage holes and a well-draining mix helps limit rot.
How to tell if a plant needs water
“Show me your leaves, and I’ll tell you how you’re doing!” To gauge a plant’s condition, start by watching its foliage. Leaves that droop, curl, dry out, or drop can signal dehydration.
Underwatering typically shows up as thin, brittle leaves with brown tips or edges. Young shoots may stop growing. Flowers wilt and sometimes drop prematurely.
However, these signs alone aren’t enough for a diagnosis. Too much sun, very dry air, or damaged roots can produce similar effects. You should also inspect the potting mix.
What to look for in the pot
Gently press your finger into the substrate. If it’s dry several inches down, the plant probably needs water. A very dehydrated potting mix can also become hard and pull away from the sides of the container.
Then heft the pot. With practice, the difference between a well-watered pot and a dry one becomes easy to recognize. This method is especially handy for plants in small containers.
How to rehydrate a very dry plant?
If the potting mix can still absorb water, water slowly across the entire surface. Continue until the excess drains out of the drainage holes. Then empty the saucer or cachepot.
When the substrate is very dry, water may run down the sides of the pot without dampening the root ball. In that case, place the pot in a basin containing a few centimeters of water. Let the root ball soak for about fifteen minutes, then drain it thoroughly.
However, avoid repeating watering on the same day. A stressed plant needs time to rehydrate. Only trim away completely dry parts and wait a few days before adding fertilizer.
Be careful not to overwater your plants
“Too much is as bad as too little”: this saying applies perfectly to watering. A waterlogged substrate contains less air. Yet roots need oxygen to function properly.
If this situation persists, the roots weaken and can rot. The plant then struggles to absorb water and nutrients properly. Paradoxically, it can start to wilt even though the potting mix is moist.
Permanent moisture also fosters certain diseases and the appearance of fungus gnats. So don’t confuse regular humidity with stagnant water.
What are the signs of overwatering?
Leaves that turn yellow, become soft, and fall off can indicate excess water. The base of the stems may brown or soften. A bad odor, surface mold, and soil that stays damp for several days should also alert you.
Symptoms do vary by species. A single yellow leaf may simply be natural aging. Before watering again, therefore, systematically check the condition of the potting mix.
How to save an overwatered plant?
Start by removing any water present in the saucer or cachepot. Next, suspend watering and place the plant in a bright spot, away from direct hot sun, with good air circulation.
If the substrate is only moist, let it dry naturally. Do not compress it or add fertilizer. On the other hand, if the soil is waterlogged, gives off a bad smell, or the stems are softening, repotting may become necessary.
Carefully lift the root ball and inspect the roots. Healthy roots are usually firm. Using a clean tool, remove any that are black, soft, or decomposed. Then repot the plant into fresh, appropriate substrate, using a pot with drainage holes.
The right move
Don’t follow a rigid watering schedule. Needs vary by species, season, light, temperature, and pot size. Always check the moisture of the substrate first.
Best practices for balanced watering
Prefer watering the potting mix rather than the foliage, using water at room temperature. Pour slowly to moisten the entire root ball, then let the excess drain away. A small amount given too often only moistens the surface and promotes shallow rooting.
The rule of the first dry inch works for some plants, but not for all. Cacti, succulents, and ZZ plants tolerate more drying. Conversely, some ferns prefer a slightly moister substrate.
Generally reduce watering in fall and winter when growth slows. Also be mindful with large cachepots: water can accumulate there without being visible.
Finally, choose an appropriate potting mix and a container with holes. Good drainage remains the best protection against overwatering. With a few simple checks, your plants will tell you when they’re truly thirsty.
