For stone fruit, when nitrogen goes on matters as much as how much.
Peach and nectarine research — the best-studied stone fruit, and the model crop for the family, including plums and prunes — shows that shifting nitrogen later in the season can hold yield while cutting the excess vegetative growth that follows harvest. Because that balance depends on your variety’s harvest date, we build every stone fruit program with you.
Uptake runs mid-spring through early fall — timing decides the rest.
CDFA FREP research shows nitrogen uptake in peach is minimal during dormancy and low during bud swell, then greatest from mid-spring through early fall, continuing for as long as leaves stay physiologically active. A FREP-funded study on ‘Early Maycrest’ peaches in Yolo County found that trees fed 50 lb N/acre of soil-applied nitrogen in September plus 50 lb N/acre of foliar urea in October held yields equal to trees fed the same total N in a heavier spring program — but with lower post-harvest leaf nitrogen and less summer pruning required. That matters most for early, May- or June-harvested varieties, which can turn overly vigorous after harvest if spring-loaded with nitrogen; later-harvested varieties have more built-in flexibility in timing.
Stone fruit fertilizer rates and timing.
Use these COFI application rates with your orchard-specific plan. Match the applications to tree age, crop load, variety, harvest timing, and existing nitrogen supply.
| Timing | Product | Rate |
|---|---|---|
| Preplant | Phyta-Grow® Leafy Green Special 7-1-2 | 1,000 lb/acre |
| Pre-bloom | Phyta-Grow® Leafy Green Special 7-1-2 | 300-500 lb/acre |
| Post-cultivation first bloom | Phytamin® Jumpstart 4-1-1 | 20 gal/acre |
| 60 days after first bloom | Phytamin® Jumpstart 4-1-1 | 16-30 gal/acre |
How much nitrogen stone fruit needs.
These CDFA FREP and UC figures provide demand context for the application rates above. Actual demand depends on your variety’s harvest timing, tree age, yield goal, and existing nitrogen supply.
| Variety timing | Guidance |
|---|---|
| Early, May–June harvest | Favor late-summer/fall N over heavy spring applications to avoid post-harvest overvigor |
| Later-harvested varieties | Uptake continues mid-spring through early fall; more flexibility in timing |
| Typical seasonal total | ~100–150 lb N/acre/year for a mature bearing orchard |
These ranges shift with the factors below — which is why stone fruit resists a one-size-fits-all program:
Let’s build your stone fruit program.
A COFI agronomist can help adapt the Phyta-Grow® Leafy Green Special and Phytamin® Jumpstart rates above to your orchard’s variety, harvest date, soil type, and yield goal.
Talk to a COFI agronomistSeasonal nitrogen uptake and fruit N removal: CDFA FREP California Crop Fertilization Guidelines, Peach and Nectarine Nitrogen Uptake and Partitioning. Fall-timing and foliar research: UC Davis Nutrient Management, Peach/Nectarine, citing FREP-funded trials in Yolo and Fresno Counties. Product analysis: Phyta-Grow® and Phytamin® CDFA-registered labels, California Organic Fertilizers.
THE ORGANIC AGRONOMIST
Growing Organic Stone Fruit: Matching Nitrogen Supply to Crop Demand and Tree Vigor
Explore how nitrogen timing, crop load, and tree vigor help organic stone fruit growers support healthy growth, fruit quality, and productive orchards.
