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Watermelon ‘King Of Hearts’ – Growing Tips For King Of Hearts Melon Plants

Watermelon ‘King Of Hearts’ – Growing Tips For King Of Hearts Melon Plants



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By: Bonnie L. Grant, Certified Urban Agriculturist

What would summer be without watermelon? Seeded or unseeded are both delicious, but the seeded is best if you like to frolic like a kid and spit seeds. For those of us who are more mature, King of Hearts is an excellent seedless melon. King of Hearts melon plants need plenty of sun and heat to produce the big fruits. Try growing a King of Hearts watermelon and forget about the seeds as you eat it like a grown up.

King of Hearts Melon Plants

The watermelon ‘King of Hearts’ is ready to eat in around 85 days. What is a King of Hearts melon? Botanically known as Citrullus lanatus, this is one of the top long vine melons. By long vine, we mean it needs a lot of space in which to grow and produce those summer fruits. There are more than 50 varieties of watermelon grown around the world. King of Hearts was developed in Mercer Island, WA.

Seedless watermelons have been around for nearly 60 years but have recent popularity since the 1960’s. These varieties are triploid melons whose seeds are either absent or are present but are so tiny and soft they are easy to eat. The fruits are just as tasty and juicy as seeded varieties and weigh between 10 and 20 pounds.

The watermelon ‘King of Hearts’ is a lightly striped type and weighs an average of 14 to 18 pounds. Any seeds present are undeveloped, whitish and soft, making them completely edible. King of Hearts has a thick rind and stores and travels well.

How to Grow King of Hearts Melons

This seedless variety needs a pollinating partner to produce fruit. A suggested watermelon is Sugar Baby. Watermelons do not transplant well but can be planted 6 weeks before the date of last frost and gently moved outdoors. In regions with longer growing seasons, seeds can be planted directly into the bed in which they will grow.

Space King of Hearts melon plants 8 to 10 feet (2 to 3 m.) apart. Watermelons need full sun in nutrient rich soil. Most growers recommend planting seed in a mound amended with plenty of compost. Place several seeds and thin to the most robust plant after seedlings have achieved a second set of true leaves.

Care of King of Hearts Melons

Growing King of Hearts melons requires a long day of sun exposure, plenty of heat, water and room to grow. In smaller spaces, erect a stout trellis or ladder and train the plants vertically. Each fruit should have a platform or slat upon which to rest so their weight doesn’t rip them off the vine.

Melon roots can reach 6 feet (1.8 m.) deep and find some moisture but they will still need regular irrigation. Remember, melons are filled with juicy flesh and that flesh needs plenty of water. Place mulch or straw under developing fruit to minimize contact with soil which can cause damage or insect infestation. Harvest watermelon fruits when they sound hollow as you tap them and the rind is deeply striped.

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Plant Finder

King of Hearts Bleeding Heart

King of Hearts Bleeding Heart flowers

King of Hearts Bleeding Heart flowers

King of Hearts Bleeding Heart in bloom

King of Hearts Bleeding Heart in bloom

Other Names: Fernleaf Bleeding Heart, Fringed Bleeding Heart

King of Hearts Bleeding Heart features delicate nodding rose heart-shaped flowers dangling from the stems from mid spring to mid summer. Its ferny compound leaves remain grayish green in color throughout the season. The fruit is not ornamentally significant.

King of Hearts Bleeding Heart is an herbaceous perennial with a mounded form. It brings an extremely fine and delicate texture to the garden composition and should be used to full effect.

This plant will require occasional maintenance and upkeep, and should be cut back in late fall in preparation for winter. It is a good choice for attracting butterflies to your yard, but is not particularly attractive to deer who tend to leave it alone in favor of tastier treats. It has no significant negative characteristics.

King of Hearts Bleeding Heart is recommended for the following landscape applications

  • Mass Planting
  • Rock/Alpine Gardens
  • Border Edging
  • General Garden Use
  • Container Planting

King of Hearts Bleeding Heart will grow to be about 8 inches tall at maturity, with a spread of 12 inches. When grown in masses or used as a bedding plant, individual plants should be spaced approximately 10 inches apart. Its foliage tends to remain low and dense right to the ground. It grows at a slow rate, and under ideal conditions can be expected to live for approximately 10 years. As this plant tends to go dormant in summer, it is best interplanted with late-season bloomers to hide the dying foliage.

This plant does best in partial shade to shade. It prefers to grow in average to moist conditions, and shouldn't be allowed to dry out. It is not particular as to soil pH, but grows best in rich soils. It is quite intolerant of urban pollution, therefore inner city or urban streetside plantings are best avoided. Consider applying a thick mulch around the root zone over the growing season to conserve soil moisture. This particular variety is an interspecific hybrid, and parts of it are known to be toxic to humans and animals, so care should be exercised in planting it around children and pets. It can be propagated by division however, as a cultivated variety, be aware that it may be subject to certain restrictions or prohibitions on propagation.

King of Hearts Bleeding Heart is a fine choice for the garden, but it is also a good selection for planting in outdoor pots and containers. It is often used as a 'filler' in the 'spiller-thriller-filler' container combination, providing a mass of flowers against which the thriller plants stand out. Note that when growing plants in outdoor containers and baskets, they may require more frequent waterings than they would in the yard or garden. Be aware that in our climate, most plants cannot be expected to survive the winter if left in containers outdoors, and this plant is no exception. Contact our experts for more information on how to protect it over the winter months.


What Is A King Of Hearts Melon: How To Grow King Of Hearts Watermelon Vines - garden

Feed 100 - 150 ppm N at each watering.

Provide 8-10 weeks of cold temperatures below 40° F.

Downy mildew, Fusarium wilt, powdery mildew, rust, Sclerotium and Verticillium wilt that may occasionally be observed.
Aphids, caterpillars, fungus gnat larva, slugs, spider mites, thrips and whiteflies commonly feed on dicentra.

Plant bare root plants in late winter to spring. Small plugs are best planted in late summer and bulked before vernalization.

Most dicentra prefer moderate moisture.
Dicentra 'Fire Island' prefers to be slightly moist.

Eyes slightly below the soil line.

If height control is required, daminozide (B-Nine or Dazide) is effective at reducing elongation. One to two applications of 2,500 ppm should provide adequate height control.

Dicentra prefer moderate shade in production.
Dicentra 'Fire Island' prefers full sun.

Take note that Dicentra 'Fire Island' requires different growing conditions than Dicentra spectabilis types.
Dicentra 'Fire Island' should be potted in no larger than a trade one gallon container due to it's compact size.


What Is A King Of Hearts Melon: How To Grow King Of Hearts Watermelon Vines - garden

Amore™ King of Hearts flowers

Amore™ King of Hearts flowers

This stunning variety features white flowers with bright red heart shaped patterns mounded habit makes it ideal for hanging baskets, patio containers and garden landscapes attracts pollinators heat and drought tolerant low maintenance

Amore™ King of Hearts is clothed in stunning white trumpet-shaped flowers with red overtones at the ends of the stems from mid spring to mid fall. Its tomentose pointy leaves remain green in color throughout the season. The fruit is not ornamentally significant.

Amore™ King of Hearts is a dense herbaceous annual with a mounded form. Its medium texture blends into the garden, but can always be balanced by a couple of finer or coarser plants for an effective composition.

This plant will require occasional maintenance and upkeep. Trim off the flower heads after they fade and die to encourage more blooms late into the season. It is a good choice for attracting butterflies and hummingbirds to your yard, but is not particularly attractive to deer who tend to leave it alone in favor of tastier treats. It has no significant negative characteristics.

Amore™ King of Hearts is recommended for the following landscape applications

  • Mass Planting
  • Border Edging
  • General Garden Use
  • Container Planting
  • Hanging Baskets

Amore™ King of Hearts will grow to be about 12 inches tall at maturity, with a spread of 14 inches. When grown in masses or used as a bedding plant, individual plants should be spaced approximately 10 inches apart. Its foliage tends to remain dense right to the ground, not requiring facer plants in front. This fast-growing annual will normally live for one full growing season, needing replacement the following year.

This plant does best in full sun to partial shade. It prefers to grow in average to moist conditions, and shouldn't be allowed to dry out. It is not particular as to soil type or pH. It is highly tolerant of urban pollution and will even thrive in inner city environments. This particular variety is an interspecific hybrid. It can be propagated by cuttings however, as a cultivated variety, be aware that it may be subject to certain restrictions or prohibitions on propagation.

Amore™ King of Hearts is a fine choice for the garden, but it is also a good selection for planting in outdoor containers and hanging baskets. It is often used as a 'filler' in the 'spiller-thriller-filler' container combination, providing a mass of flowers against which the thriller plants stand out. Note that when growing plants in outdoor containers and baskets, they may require more frequent waterings than they would in the yard or garden.


Watch the video: How To Grow Melon ADVANCED Growing Guide - Part 1 of 2