Fertilising guide
How to fertilise Pawpaw 'Susquehanna' (Asimina triloba 'Susquehanna')— schedule & NPK
Also called Susquehanna pawpaw.
More about pawpaw 'susquehanna'
About Pawpaw 'Susquehanna'
Asimina triloba 'Susquehanna' · also called Susquehanna pawpaw · edible
'Susquehanna' is a Peterson pawpaw selection famous for very large fruit, thick buttery flesh and notably few, small seeds. This hardy deciduous understorey tree of eastern North America crops in temperate gardens but needs a second, genetically different cultivar to pollinate it. Give young trees light shade, mature trees full sun, and deep, moist, well-drained soil.
Growth habit: Small, neatly pyramidal deciduous tree with large drooping leaves and maroon spring flowers; tends to be a slightly less vigorous, more compact grower. Suckers to form clumps and is self-incompatible, needing a different cultivar nearby.
What fertiliser pawpaw 'susquehanna' actually wants — and why
Pawpaw 'Susquehanna' feeds in two distinct phases — balanced to build the plant, then high-potassium the moment flowering starts to set and fill a heavy crop.
Balanced (even N-P-K) at planting for roots and frame, then switch to a high-potassium ("high-potash") tomato-style feed once the first flowers open — potassium is what sizes and ripens fruit, not nitrogen.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for pawpaw 'susquehanna': match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed pawpaw 'susquehanna', and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For pawpaw 'susquehanna':
Apply a balanced spring feed or compost as growth begins, with a light supplementary feed in early summer to support the large fruit. Go easy on nitrogen to favour fruit over foliage; annual organic mulch covers most needs on good soil. So: a balanced feed or compost at planting, then a high-potash liquid every 1-2 weeks from first flower through harvest across the main season (spring through early autumn).
The dormant-season rule matters more than the exact interval: skip feeding entirely when pawpaw 'susquehanna' is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for pawpaw 'susquehanna'
Follow the crop-feed label rate for pawpaw 'susquehanna' — these are calibrated for hungry vegetables. Consistency through fruiting matters more than strength; erratic feeding causes problems like blossom-end rot.
Feeding always goes onto already-damp soil, never dry roots — water pawpaw 'susquehanna' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the pawpaw 'susquehanna' watering schedule.
Signs you are over-feeding pawpaw 'susquehanna'
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for pawpaw 'susquehanna':
- Vigorous dark-green leafy growth but few flowers or fruit (excess nitrogen).
- Lush foliage hiding the crop; soft growth prone to pests and disease.
- Salt crust on the soil and scorched leaf edges in containers.
Signs you are under-feeding pawpaw 'susquehanna'
- Pale, yellowing lower leaves and stunted growth.
- Small fruit, poor set, and a quickly exhausted plant.
- Blossom-end rot and weak cropping from erratic or insufficient feeding.
If the symptoms point at watering, light or roots rather than nutrition, the full pawpaw 'susquehanna' care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
In containers, fertiliser salts build up fast — water pawpaw 'susquehanna' thoroughly so excess drains from the base each time, and flush pots with plain water every few weeks to prevent a damaging salt build-up.
Organic vs synthetic feeds for pawpaw 'susquehanna'
Organic options
Garden compost or well-rotted manure dug in before planting, plus a liquid comfrey or seaweed feed once fruiting starts. UK: comfrey feed or organic Tomorite; US: Espoma Tomato-tone or Neptune's Harvest. Builds soil and feeds in one.
Synthetic / liquid feeds
A balanced feed at planting then a high-potash tomato feed in fruiting — UK: Growmore at planting then Tomorite (Levington) or Phostrogen; US: a balanced 10-10-10 then Miracle-Gro Tomato or a bloom booster.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising pawpaw 'susquehanna' — frequently asked questions
What fertiliser does pawpaw 'susquehanna' need?
Balanced (even N-P-K) at planting for roots and frame, then switch to a high-potassium ("high-potash") tomato-style feed once the first flowers open — potassium is what sizes and ripens fruit, not nitrogen. Pawpaw 'Susquehanna' feeds in two distinct phases — balanced to build the plant, then high-potassium the moment flowering starts to set and fill a heavy crop.
How often should I feed pawpaw 'susquehanna'?
Apply a balanced spring feed or compost as growth begins, with a light supplementary feed in early summer to support the large fruit. Go easy on nitrogen to favour fruit over foliage; annual organic mulch covers most needs on good soil. Apply a balanced spring feed or compost as growth begins, with a light supplementary feed in early summer to support the large fruit. Go easy on nitrogen to favour fruit over foliage; annual organic mulch covers most needs on good soil. So: a balanced feed or compost at planting, then a high-potash liquid every 1-2 weeks from first flower through harvest across the main season (spring through early autumn).
What strength of feed for pawpaw 'susquehanna'?
Follow the crop-feed label rate for pawpaw 'susquehanna' — these are calibrated for hungry vegetables. Consistency through fruiting matters more than strength; erratic feeding causes problems like blossom-end rot.
What does over-feeding pawpaw 'susquehanna' look like?
Vigorous dark-green leafy growth but few flowers or fruit (excess nitrogen). Lush foliage hiding the crop; soft growth prone to pests and disease. Salt crust on the soil and scorched leaf edges in containers. Staying on a high-nitrogen feed once pawpaw 'susquehanna' starts flowering is the classic error — you get a huge leafy plant and a disappointing crop. Switch to high-potash the moment flowers appear.
Should I flush the soil of pawpaw 'susquehanna'?
In containers, fertiliser salts build up fast — water pawpaw 'susquehanna' thoroughly so excess drains from the base each time, and flush pots with plain water every few weeks to prevent a damaging salt build-up.
Keep reading
- Pawpaw 'Susquehanna' care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water pawpaw 'susquehanna' — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise tomato
- How to fertilise pepper
- How to fertilise cucumber
- All 5561 fertilising guides in the Growli library