If you’re asking about the claim in that gardening headline, the key is that geraniums (Pelargonium) generally do better with thorough watering followed by some drying, rather than keeping the soil constantly wet.
A good watering approach
Check the soil first. Water when the upper few centimeters of soil have dried rather than watering automatically every day.
Water deeply. Apply water until some drains from the bottom of the pot, so the root ball is thoroughly moistened.
Empty excess water. Don’t let the pot sit in a saucer of standing water; consistently soggy roots can lead to root rot.
Water the soil, not the flowers and leaves. This helps reduce fungal problems.
Water according to conditions. Geraniums in hot, sunny weather may need substantially more frequent watering than those in cool or humid conditions.
Use a container with drainage holes and a well-draining potting mix.
For flowering, watering is only part of the equation. Adequate sunlight, regular removal of spent flowers, appropriate feeding, and good drainage are also important.
And be skeptical of claims that a special watering trick will make geraniums “always” bloom. There isn’t a single watering method that guarantees continuous flowering; the plant’s light, temperature, nutrition, variety, and growing conditions all matter.
