They are tolerant of a wide range of soil types and situations but best planted in fertile, well-drained soil in full sun when danger of frost is over, usually May to early June. Planting could be carried out slightly earlier in southern counties or later in the north of England and Scotland. Cut plants to the ground after the first frosts have blackened the foliage.
In mild regions and on well-drained soils, leave the tubers in the ground and cover with a 7. In colder areas or on heavy soils, lift and store the tubers see below and replant the following spring. There are many great dahlias to choose from for the garden. Pick from the handful below or see a fuller list in our Find a Plant here. With deep bronze-purple foliage and dark red double flowers. Height cm 20in-2ft D.
Glossy dark purple foliage. Height 1. Dark green foliage. Height up to 1. Height 1m 3ft D. Height 90cm Join the RHS today and get 12 months for the price of 9. Take action Why take action? Support us Donate Careers Commercial opportunities Leave a legacy. Join the RHS today and support our charitable work Join now. Hot links Browse inspiration articles Buy plants online. Buy tickets. RHS members get reduced ticket prices Join now. Most dahlias need to be staked and you may want to plant a sturdy stake before you plant the dahlia.
If you put the stake into the ground after the plant is growing, take care to avoid damaging the tuber or the root system. Tomato cages can also be a simple approach to staking. The eye is the point on the shoulder, or crown, of the tuber from which the plant grows. If you are planting a number of dahlias in the same location, they should be separated by about 2 feet to give each plant room to grow.
Small dahlia plants are susceptible to slug damage. It is a good idea to manually remove slugs early each morning or to protect them with a commercial slug killer. Japanese beetles seem to enjoy eating dahlia blooms just when they are ready for a bouquet. One of the best methods of control is to manually remove the beetles into a bucket of soapy water. Follow label directions carefully if you choose to do that. Dahlias take well to an organic approach to gardening.
They are strong, robust growers with lots of blooms, including very large blooms. They do well in soil with lots of organic content even in the absence of chemical fertilizers. Pest control is not essential and can be reasonably well accomplished without resorting to chemical pesticides. Our suburban shrubbery and gardens are increasingly susceptible to damage by deer. Young dahlia plants do not need a lot of water; in fact, excessive water can lead to rotting of the plant.
For larger plants, a good rule of thumb is to water if the rainfall is less than one inch in seven days. Pots require more regular watering. The best strategy for fertilizing is to begin with a soil test to determine pH and the specific soil needs.
Lacking that information, the plants will generally benefit from regular treatments with a water soluble or granular fertilizer. Traditional wisdom for dahlias is to treat with a high nitrogen fertilizer through the middle of the season but minimize nitrogen at the end of the season. There is a substantial regimen that can be used for maintaining plants for show blooms. For the simple enjoyment of spectacular dahlias in your garden, there are two relatively simple actions that will enhance the appearance of the plant.
This is aimed at preventing the rotting of tubers due to clumping. Tackle the problem by baiting the slugs and snails with a mug of beer to which they are attracted to.. Happy gardening folks! You must be logged in to post a comment. March 10, Share on Facebook Share on Twitter.
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