Jemmer F1


A compact, bushy courgette with bright yellow fruits that can easily be seen through the foliage. Easy to germinate and very prolific.

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Germination7 - 10 Days
Sowing MethodStart in Pots / Trays
Days to Maturity50 Days
Seed Count10
Recommended Soil pH6.0-7.0

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[75 days] Jemmer F1 is very popular courgette variety that is usually cultivated as an annual in our British climes. It sports numerous, hairy, dark-green leaves and yellow flowers, followed by bright yellow fruits later in the summer. In addition to being super easy to spot (no more marrows!), the fruits are smooth and tender, with just enough crisp to add that extra sensation of freshness. The yields are extraordinary and will continue throughout the growing season and until the first frost.

This variety is resistant to powdery mildew.

RHS Award of Garden Merit

Starting out

Like all squash, courgettes are heavy feeders and benefit from being planted in areas that have been augmented with lots of compost and well-rotted manure.

Starting Indoors: Sow 2-3 seeds in 2" modules 3 weeks before transplanting outdoors (peat or cardboard containers are ideal). Be careful not to over water, as squash seeds are quick to rot in overly moist, airless compost or soil.

Sowing Seeds Indoors
Transplant to Pots

Thin to strongest 1-2 plants per module. Harden off gradually and transplant outside after all danger or frost has passed and the weather is warm and settled. (In most climates this is towards the end of May.) Squash has a very tender rooting system so be extra careful not to disturb.

Plant 1m square (3’ sq.)

Direct Seed: Sow in late spring when the soil has warmed to around 70°F (21°C) and the danger of frost has passed. Sow 1-2 seeds 1m square (3’ sq.) apart and 1/2-1" deep. Thin to 1 plant per spot.

For best results, plant at the top of a shallow mound. As the squash grows it will produce a mass of white roots on the surface of the soil. Cover these with compost or well-rotten manure as they appear.

Sow direct to ground
Watering and Feeding

Maintenance & Harvest

Keep courgette plants well watered at every stage of their development. Water is especially essential when the plants are in flower and when the fruits have started to swell. Lack of consistent watering can lead to blossom end rot. If you wind up with blossom end rot, remove affected fruit immediately.

Courgettes are heavy feeders and can enjoy up to weekly feedings of liquid seaweed or other similar fertilizers. Mulch well to discourage weeds and conserve water.

Harvest fruits when they reach somewhere around 10cm (4”) long. Although you can twist them off, it’s often easier to cut them off at the base. Just be careful not to accidentally cut into the other parts of the plant (easier to do than one might think!).

Pick fruits regularly (about 3x a week) at the height of the season to keep the plants producing. Best eaten fresh.

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