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How to Grow Dahlia Flowers

Analysis by Dr. Joseph Mercola Fact Checked

how to grow dahlia flower

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  • Dahlias may be grown in the ground or in containers, but require plenty of space, so allow a full square foot for each tuber planted. The plant enjoys rich, fertile soil, plenty of moisture once growth is established and benefits from deadheading or cutting through the season to produce more blooms
  • Plant lovers may choose dahlia cultivars from a variety of blooms ranging from dwarf pom poms to those growing as much as 1 foot across on plants as tall as 4 feet. In USDA Hardiness Zones 8 to 11 they grow as perennials, but you may easily overwinter the tuber and replant in the spring
  • The tubers do best with only slightly moist soil until the plant is fully established; if overwatered the tuber may rot and not produce a plant. In a sunny location, the plants will thrive and bloom from June until the first frost in the fall
  • Experts disagree on the amount of fertilizer dahlias require but do agree it should be low in nitrogen. The American Dahlia Association believes testing the soil is the best approach, along with using organic content and little to no chemical fertilizer. This may produce beautiful blooms you may use to decorate your home. Once cut they can last up to one week; if dried they can be enjoyed year-round

The dahlia plant produces flowers in a range of colors, shapes and sizes. The flowers are often loved by gardeners as they have one of the longest blooming periods compared to other plants. Dahlias will start blooming in June and many continue to flower until the first frost.


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