HarkoNectarineCare. Harco nectarinecare is easier than you might think. This variety of fruit tree is cold hardy and also disease resistant. It is very adaptable to soil, as long as it drains well. HarkoNectarine Tree quantity. Add to cart.Learn how to plant and care for your tree or plant with our downloadable PDF Care Guides. Thank you for choosing Bob Wells Nursery. The HarkoNectarine fruit is a variety of the peach tree. Nectarines and peaches are similar in appearance and color as they differ only by a single gene, the gene for skin texture. Harkonectarine is a cold hardy Canadian selection with a skin like the sunset and flesh like a sweet sunrise! Hardy to USDA Zone 5. Plus, you won't have to deal with finicky care or fuss to get a bounty of delicious nectarines.HarkoNectarine Trees are self-pollinating. You will get fruit with only one plant. 4. HarkoNectarine.Nectarine Tree Location & Care. Nature Hills Nursery makes it easy to order your own Nectarine online without leaving the comfort of your home. HarkoNectarine is resistant to bacterial spot, brown rot. Self-fertile. Zone 5-8.Recommended growing and care: Full sun, warm & protected locations with balanced moisture. Harkonectarine trees are known for their medium-sized, sweet, and juicy fruit with smooth, deep red skin. This freestone variety is ideal for fresh eating, baking, or making preserves. The nectarine ‘Harko’ tree grows well in cold regions. Like other nectarines, the fruit is a close relative of the peach, genetically identical except that it lacks the gene for peach fuzz. Nectarine 'Harko' is a Canadian yellow nectarine variety that develops sweet, freestone pit fruit mid to late summer. Large, showy, pink blooms pollinize other nectarine trees in spring.