Should you fertilize after pruning?
Written by
Nguyen Minh
Reviewed by
Prof. Charles Hartman, Ph.D.Prune fruit trees first, then fertilize. I once saw a pear tree do poorly after feeding early. Wait until new shoots reach 5-7cm (2-3 inches) before feeding. This gives the cuts time to heal and any energy put into rooting and not putting into new growth.
Timing Guidelines
- Delay 4-6 weeks after major pruning
- Apply when new leaves unfurl fully
- Avoid feeding during drought conditions
Formula Selection
- Use 10-10-10 for balanced nutrition
- Avoid high nitrogen (prevents fruiting)
- Add micronutrients zinc/iron in alkaline soils
Application Methods
- Broadcast 30cm (12 inches) from trunk
- Water deeply post-application
- Mulch to prevent nutrient runoff
Regional climate determines schedules. My clients in the Pacific Northwest fertilize pruned apple trees in May when the soil reaches 10°C (50°F). Arizona growers fertilize citrus in March so they have sufficient nutrition before temperatures get too hot. Use a soil thermometer at least 15cm (6 inches) deep into the soil. Do not feed if there is a risk of frost.
Growth Signs
- 3-5 new leaves per spur
- Bark callusing around cuts
- No oozing at pruning sites
Soil Prep
- Test pH 6.0-6.5 range
- Moisten before fertilizing
- Aerate compacted zones
Regional Adjustments
- Coastal zones: Add magnesium
- Clay soils: Reduce phosphorus
- Sandy soils: Increase potassium
Trees that were fertilized too much will often grow beyond their structure. A client had pruned a plum tree that had been over-fertilized and it produced 2m (6ft) of water sprouts and no fruit. To remedy this problem, deep irrigation flushes excess nutrients from the root zone and encourages the trees to use the remaining nutrients. If the yellowing of leaves persists, consult with arborists as the yellowing may be rooted damage from poor pruning cuts.
Read the full article: How to Prune Fruit Trees: A Step-by-Step Guide
