Calibrachoa, often called "million bells," is a drought-tolerant plant but thrives best with consistent moisture. In summer, high temperatures and intense sunlight increase water evaporation from the soil and transpiration from the leaves. The plant's shallow root system also makes it susceptible to drying out quickly. Therefore, regular watering is essential to maintain healthy growth and prolific blooming.
Several factors determine how often you should water calibrachoa in summer:
a. Climate and Temperature: In hot, dry climates, daily watering may be necessary. In humid regions, watering every 2-3 days might suffice.
b. Soil Type: Well-draining soil retains moisture without becoming waterlogged. Sandy soils dry out faster, while clay soils hold water longer.
c. Container vs. Ground: Potted calibrachoa dries out faster than those planted in the ground. Containers may need watering once or even twice a day in extreme heat.
d. Sun Exposure: Plants in full sun require more frequent watering than those in partial shade.
a. Underwatering: Wilting leaves, dry soil, and reduced flowering are key signs. The plant may recover quickly after watering, but prolonged drought stunts growth.
b. Overwatering: Yellowing leaves, root rot, and a soggy soil surface indicate excess water. Poor drainage exacerbates this issue, leading to fungal diseases.
a. Morning Watering: Water early in the day to reduce evaporation and allow foliage to dry, preventing fungal diseases.
b. Deep Watering: Ensure water reaches the root zone. For containers, water until it drains from the bottom.
c. Mulching: Apply a layer of mulch to retain soil moisture and regulate temperature.
d. Monitor Soil Moisture: Check the top 1-2 inches of soil. If dry, it’s time to water.
In summer, calibrachoa typically needs watering every 1-2 days, depending on conditions. Potted plants may require daily attention, while garden-planted ones can often go longer. Observe the plant’s response and adjust accordingly. During heatwaves, increase frequency, and reduce it during cooler spells or rainfall.
a. Fertilization: Use a balanced, water-soluble fertilizer every 2-3 weeks to support blooming.
b. Pruning: Trim leggy stems to encourage bushier growth and more flowers.
c. Pest Control: Watch for aphids or spider mites, which thrive in dry conditions. Regular watering helps deter infestations.
