Blueberry ( Vaccinium ) - Duke / Size 1
Duke Blueberry / Vaccinium

*Availability Status: Winter dormancy - Estimated avail spring 2023
*Average Plant Shipping Size: 8" - 12" tall / Quart size rootball

*No Shipments to California, Alaska, or Hawaii

Our Price: $7.95

Product Code: BLUDUK1

Vaccinium 'Duke'

Overall Description

Duke is a Northern highbush blueberry cultivar which is well known for good cold hardiness, vigor, and large numbers of 1/4" - 1/2" light blue colored fruit with good sweetness. Mature Duke specimens will mature at a slightly larger / taller size than many other highbush varieties if left to grow naturally, and untrimmed. To obtain maximum fruit yield, a second variety of Blueberry is recommended to be planted within close proximity - doing so will usually increase both fruit set, as well as fruit size. Be sure to try and select another variety that tends to bloom at around the same time, which will maximize pollination, and berry set. Foliage of Duke is rather large leaved ( up to 3" - 3 1/2" long ), oval shaped, and very nice deep green in color. Fall coloration consists of very attractive shades of yellow & orange.

White bell shaped blooms begin in May, with fruit set beginning shortly after - beginning to ripen in mid season ( mid to late June in East TN ). Most all blueberry cultivars tend to have rather shallow root systems, which will require adequate amounts of water........especially during fruiting. Duke is known to be one of the easiest Blueberry varieties to grow, and is a great choice for beginners who wish to produce berries of their own.

Plant Facts & Specifications

--Mature Height : 5 - 7 ft

--Mature Width : 5 - 7 ft

--Growth Rate :
Moderate to fast ( 8" - 12" avg per yr )

--Hardiness Zones :
5 - 8

--Sun Exposure :
Full to partial sun ( suggested full sun for more northern climates, and part sun for southern zones )

--Soil Preference :
Average to slightly moist - acidic, well drained. Mulch & high organic content recommended.

--Foliage Color & Texture :
Deciduous - large oval shaped leaves measuring about 3" long at full size. Good green color during the spring & summer seasons - followed by a nice display of yellow & orange colors in fall.

--Flower, Cone, Or Berry Facts :
Flowers & Berries -white bell shaped flowers begin to appear in spring ( early May in East TN ), followed by fruit set with young fruits starting out as a pale green color and ripening to blue in mid season ( mid June in East TN ).

--Diseases / Insects :
Potential but infrequent disease problems include stem blight, root rot, anthracnose, cane cankers, mildew and botrytis. ‘Duke’ is noted for having good resistance to phytophthora root rot. Chlorosis ( yellowing of leaves ) has been noted in soils with high pH.

--Recommended Spacing :
3 - 5 ft apart recommended

--Deer Resistance Rating :
Lowest Resistance [ 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 ] Highest Resistance

--Fertilization / Feeding :
For maximum health & hardiness, we highly recommend a good grade granular ( preferably organic ) fertilizer / plant food for use with all of our plant species. We personally use, and recommend the Espoma line of organic plant foods, as they are super effective yet gentle enough to use on even the most delicate of evergreen species where fertilizer burn would normally be a major concern. However, a water soluble type plant food (Miracle Gro, or equivalent ) are also acceptable options. Other granular fertilizers with a 6 - 12 - 12, or 10 - 10 - 10 ratio can also be used - but we suggest using them at 1/2 - 3/4 strength to avoid any chemical burn issues to the root system of the plants. Best to fertilize in early spring, and again in mid fall - avoid feeding standard chemical fertilizers during hot summer months, and directly after transplanting. The Espoma Organic Plant Foods may be used at anytime.

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