The Delphinium genus of plants provides the home gardener with a wide range of adaptability. Tall forms make excellent dramatic backgrounds and screens, while short or medium varieties bring color to the front or center of the garden. The hollow flower spikes of higher types require support. In addition to being prized as cut flowers, delphiniums draw pollinators. Delphiniums require attention since they are susceptible to pests and disease. Knowing how to cultivate this plant properly is necessary if you want to include it in your landscaping. To learn more, keep reading below.
Water
routinely drink water, especially in the summer. These plants are susceptible to crown rot, so keep the soil wet but not soggy. Never allow the planting bed gets fully dry. To reduce fungal and leaf spot issues, water at ground level rather than drenching the leaves. A mulch covering of two to three inches helps keep the soil wet.
Fertilizer
For their dazzling flower spikes, delphiniums require plenty of nutrition. When it’s time to plant, include well-aged compost or a balanced fertilizer, such as a 10-10-10. A second treatment made in the middle of the season may extend the bloom and encourage a second bloom phase. A nutrition increase is frequently indicated when leaves begin to yellow.
Light
6 to 8 hours of daily sunshine are ideal for delphinium blooming. The plant does not thrive in dry heat, though. Improved and prolonged blooming can be achieved in an area that receives morning sun and some afternoon shade during warm weather.
Temperature and Humidity
Ideal circumstances include long, cold springtime and cooler summers with average temperatures between 70 and 80 degrees Fahrenheit. These plants detest heat and heavy humidity, and humidity can promote the growth of powdery mildew. The majority of perennial plant varieties are entirely cold hardy down to -30 degrees Fahrenheit.
Soil
The greatest results come from well-draining loamy soil with a pH of 6.5 to 7.0, which is somewhat acidic. For these heavy feeders, adding compost at planting time promotes development.
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