"So how often do you water the little dolphins?" my houseguest asked. She nodded at the pot on the east-facing kitchen windowsill. "Only when it feels bone dry," I told her. I had her push a finger into the shallow terracotta pot. The soil was still damp an inch down, so we left it alone. Watering string of dolphins runs about once every two to three weeks indoors, but that number is a guess, not a rule. The pot tells you the truth, not the calendar.
The reason there is no fixed weekly number comes down to how the plant is built. Those plump, dolphin-shaped leaves are water tanks. The plant fills them up, then lives off that stored water for days while the soil dries out around the roots. If you pour in more water before the mix has gone fully dry, the roots sit wet with nowhere to put the extra. That is how root rot starts, and it is the number one killer of this succulent.
This is why the soak and dry method beats any timer. You water deeply, let every drop drain out the bottom, then wait. The waiting is the part most people rush. Watering on a fixed schedule, say every Sunday, ignores the one thing that matters. That one thing is whether the soil is actually dry. A cool, cloudy month and a warm, sunny one need very different amounts of water, even though the calendar looks the same.
So skip the timer and check the soil instead. Two quick checks tell you everything you need.
The Finger Test
- How to do it: Push a clean finger about one inch into the soil near the edge of the pot.
- What it means: Damp or cool soil means wait, while dry, crumbly soil that does not cling to your skin means it is time to water.
- Why it works: It reads moisture right at root level, which is where rot actually begins, not just the dry crust on top.
A Moisture Meter
- How to do it: Slide a cheap moisture meter into the mix and read the dial, waiting until it sits firmly in the dry zone.
- Why bother: It takes the guesswork out for new growers and for deep pots your finger cannot reach.
- Watch for: Terracotta dries faster than plastic, so the same plant in a clay pot will read dry sooner and need water more often.
The Weight Test
- How to do it: Lift the pot right after a soak so you learn how heavy a fully watered plant feels.
- What it means: A pot that feels light and easy to lift has dried out and is ready for its next drink.
- Why it works: Dry soil weighs far less than wet soil, so your hands can judge moisture without touching the mix at all.
Light and pot size shift your real succulent watering schedule more than any chart can. A plant in bright, indirect light in a shallow clay pot drinks faster than one in a plastic pot in a dim corner. That is the whole point of checking dryness instead of counting days. You let the plant and its spot set the pace, and you just respond to what you find.
When you do water, water well. Take the pot to the sink, soak the mix until water runs freely from the drainage holes, then let it drain fully before it goes back on the saucer. Never let it stand in a tray of leftover water, because that quietly undoes everything the dry spell did for the roots. Deep, occasional soaks build a stronger plant than frequent little sips.
Winter watering is where most people go wrong. Growth slows in the cold months, the plant uses far less water, and the soil stays wet much longer between drinks. Keep using the finger test and you might stretch to three or four weeks between waterings, sometimes more. The plant still wants the same bone-dry trigger, it just reaches it slower, so trust the dry soil over the season on the calendar.
Get this rhythm right and your dolphins will stay plump and firm instead of going soft or mushy. If yours already shows signs of trouble, like wrinkled leaves or a sour, wet smell at the soil, head to the main care guide for the full root rot rescue steps. For everyday watering, the rule stays simple. Water deeply only when the soil is fully dry, then let it drain and wait.
Read the full article: String of Dolphins Care Guide
