Fertilising guide
How to fertilise Marketmore Cucumber (Cucumis sativus 'Marketmore')— schedule & NPK
Also called Marketmore cucumber, slicing cucumber.
More about marketmore cucumber
About Marketmore Cucumber
Cucumis sativus 'Marketmore' · also called Marketmore cucumber, slicing cucumber · edible
'Marketmore' (notably 'Marketmore 76') is a reliable open-pollinated outdoor slicing cucumber producing straight, dark-green fruit 18-20 cm long. Bred for disease resistance — including scab and cucumber mosaic virus — it is a hardy, heavy-cropping ridge type that performs well in cool-temperate gardens without a greenhouse.
Growth habit: Vigorous monoecious (male and female flowers) ridge-type vine that trails or climbs by tendrils. Can sprawl on the ground or be trained up netting; productive and resilient, with a long harvest window if picked often.
What fertiliser marketmore cucumber actually wants — and why
Marketmore Cucumber 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 marketmore cucumber: 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 marketmore cucumber, 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 marketmore cucumber:
Moderate feeder. Prepare the bed with compost, then feed every 10-14 days with a high-potash (tomato) liquid feed from the first fruit set. Limit nitrogen once fruiting to avoid leafy, fruitless plants. 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 marketmore cucumber 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 marketmore cucumber
Follow the crop-feed label rate for marketmore cucumber — 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 marketmore cucumber first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the marketmore cucumber watering schedule.
Signs you are over-feeding marketmore cucumber
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for marketmore cucumber:
- 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 marketmore cucumber
- 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 marketmore cucumber 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 marketmore cucumber 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 marketmore cucumber
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 marketmore cucumber — frequently asked questions
What fertiliser does marketmore cucumber 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. Marketmore Cucumber 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 marketmore cucumber?
Moderate feeder. Prepare the bed with compost, then feed every 10-14 days with a high-potash (tomato) liquid feed from the first fruit set. Limit nitrogen once fruiting to avoid leafy, fruitless plants. Moderate feeder. Prepare the bed with compost, then feed every 10-14 days with a high-potash (tomato) liquid feed from the first fruit set. Limit nitrogen once fruiting to avoid leafy, fruitless plants. 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 marketmore cucumber?
Follow the crop-feed label rate for marketmore cucumber — 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 marketmore cucumber 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 marketmore cucumber 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 marketmore cucumber?
In containers, fertiliser salts build up fast — water marketmore cucumber 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
- Marketmore Cucumber care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water marketmore cucumber — 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 2464 fertilising guides in the Growli library