In Ground Berry Fertilizer for Cold-Hardy Berries
$37.99
🍓 Old Cobblers Farm™ In Ground Berry Fertilizer for Cold-Hardy Berries
NPK Ratio: 5-10-10
Formulated for cold-climate berry plants, this fertilizer supports root strength, fruit production, and resilient overwintering. Its low nitrogen formula minimizes excessive foliage growth that can make plants vulnerable to frost damage, while high phosphorus and potassium enhance root systems and fruit development.
✅ 20 Cold-Hardy Berry Plants That Benefit from 5-10-10 Fertilizer
Blueberries (Vaccinium spp. – esp. northern highbush)
Raspberries (Rubus idaeus)
Blackberries (Rubus fruticosus, e.g. ‘Chester’, ‘Illini Hardy’)
Cranberries (Vaccinium macrocarpon)
Red Currants (Ribes rubrum)
Black Currants (Ribes nigrum)
White Currants (Ribes spp.)
Gooseberries (Ribes uva-crispa)
Elderberries (Sambucus nigra – ‘York’, ‘Adams’)
Lingonberries (Vaccinium vitis-idaea)
Haskap (Honeyberries) (Lonicera caerulea)
Aronia Berries (Chokeberries) (Aronia melanocarpa)
Juneberries (Amelanchier alnifolia)
Cloudberries (Rubus chamaemorus)
Thimbleberries (Rubus parviflorus)
Boysenberries (Rubus ×)
Tayberries (Rubus fruticosus × idaeus)
Loganberries (Rubus × loganobaccus)
Red Huckleberries (Vaccinium parvifolium)
Serviceberries (Amelanchier spp.)
🧤 Application Guide
📅 Frequency of Application
| Timing | Purpose |
|---|---|
| Early Spring | Support early root growth and shoot emergence after dormancy |
| Mid-Summer | Fuel flowering, fruit production, and replenish nutrient stores |
| Late Fall (Optional) | Light application in mild climates for winter root strength |
📏 Quantity
| Plant Stage | Fertilizer Amount |
|---|---|
| Established Plants | ½ cup (~100g) per mature plant |
| Young/New Plants | ¼ cup (~50g) per plant |
| Row Application | 2 cups per 10 linear feet of in-ground bed area |
🔍 Adjust rates based on plant size and results from soil testing.
🛠️ Method of Application
Preparation
Wear gloves
Loosen the top 2–3 inches of soil around the plant
Water lightly if soil is dry
Apply Fertilizer
Spread evenly in a ring around the drip line of the plant
Avoid direct contact with the stem or crown
Work into soil gently with a trowel
Water Thoroughly
Water after application to activate nutrient absorption
Reapply mulch to conserve moisture and insulate roots
🌱 Ideal Soil Conditions
| Soil Factor | Ideal Range / Practice |
|---|---|
| pH | 5.5–6.5 for most; 4.5–5.5 for blueberries |
| Soil Type | Loamy soil with good drainage and organic matter |
| Moisture | Evenly moist, never soggy; mulch to regulate and retain water |
| Organic Matter | Add compost, peat, or pine fines to improve structure and pH |
| Drainage | Essential to prevent root rot in cool, wet conditions |
💡 Pro Tip: Avoid over-fertilizing late in the season, especially in colder zones — it may encourage new growth that is vulnerable to frost damage.
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