Rubus idaeus 'Polka'
Polka Raspberry is a virtually thornless raspberry variety with a vigorous, upright growth habit. It is a self pollinating raspberry, producing abundant fruit year after year once established. Nice large fruit set is ripe & ready for picking in late summer to early fall, depending on the climate / environment this variety is planted in. Has also shown itself to be virtually immune to root rot, as well as mosaic virus complex.
Polka was developed, and released by Brzezna - Poland Experiment Station of the Research Institute of Pomology and Floriculture in Skierniewice back in 2001, as an improved version of 'Autumn Bliss' Raspberry. Fruits are rather large compared to many other raspberry cultivars, and have excellent sweetness. This variety is quite possibly the most popular fruiting primocane raspberry in all of Europe, and is quickly taking hold here in the North American market.
Pruning is essential in order to keep plants well-maintained, and producing berries at maximum potential. It is
generally best to prune out old canes as soon as fruiting is over for
purposes of encouraging the production of new canes. The more canes..........the more fruit!! Raspberry roots
are perennial but the leaf / fruit bearing canes are biennial - Meaning each
cane will only produce fruit in the second year. Leaving older, expired & already fruited canes will only slow down the berry production in seasons to come, as the canes will most likely not fruit again. They will more than likely serve as "dead weight", and will use much of the plants growth & nutrients since they are thicker & older than newer canes which are ready bear fruit.
Plant Facts & Specifications--Mature Height :
4 - 6 ft
--Mature Width :
2 - 3 ft
--Growth Rate :
Moderate to fast ( 10" - 14" avg per yr )
--Hardiness Zones :
4 - 8
--Sun Exposure :
Full to partial sun - most Raspberries prefer part sun / part shade.
--Soil Preference :
Average to slightly moist - acidic, well drained. Mulch & high organic content recommended.
--Foliage Color & Texture :
Deciduous - Bright green leaves are fairly large with slightly serrated edges.
--Flower, Cone, Or Berry Facts :
Flowers & Berries - small whitish pink flowers begin to appear in mid spring ( mid to late May in East TN ), followed by fruit set. Fruit begins to ripen in very late summer to early fall.
--Diseases / Insects :
Known to be virtually immune to root rot, and mosaic virus complex. Cane borers and crown borers are potential insect pests.
--Recommended Spacing :
3 - 4 ft apart recommended if planted in groups.
--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.