A melon of French origin with centuries of tradition, small, fragrant, and with an irresistible orange flesh.
About the variety. Round fruits with ridges and a dark green and grey corky rind, weighing 800–1100 g. The flesh is orange, sweet, and highly aromatic — a summer dessert in its own right. Pay attention to the harvest stage: fruits with a fully yellow rind are overripe (acidic and fermented); the ideal moment is when the green rind shows yellow patches. The flowers are edible and attract pollinators.
Itinerário técnico
Como cultivar melon petit gris de rennes?
Um guia de cultivo passo a passo, da sementeira à colheita.
pH ideal 6.0 to 7.0Temperatura ideal 22 to 32 °CCompasso 100 cm in the row, 100 cm between rows
Sementeira
Sow in individual pots three to four weeks before planting out, two centimetres deep, with the compost between 24 °C and 28 °C. Germination takes four to eight days. Transplant with the root ball intact and never bury the collar, which rots easily. Plant into warmed soil, above 18 °C: planting early into cold soil checks the plant for the rest of the season. The first flowers are all male and set no fruit; if later the small fruits shrivel, pollination is failing: hand pollinate early in the morning with a brush. This variety makes long vines: the spacing given is for plants trained on a support or with the vines kept in check; left to run on the ground, it takes two to three metres.
Solo
It wants loose, deep, very free draining soil rich in organic matter, with a pH between 6.0 and 7.0. It prefers ground that warms fast, such as sandy or loamy soil, and hates heavy cold soil. A raised bed with a dark mulch or film speeds the start considerably in cooler regions.
Clima
It needs a great deal of heat and sun, between 22 °C and 32 °C, and a long dry finish for the fruit to build sugar. It is the most heat dependent crop in the European vegetable garden. On the Atlantic coast and in northern Europe it rarely reaches the sweetness it achieves inland, and there a greenhouse or tunnel is close to essential. Inland in Portugal and Spain heat rather than cold is the limiting factor: in weeks above 35 °C the plant stalls and light shade over midday pays for itself. In France outdoor growing is reliable from the centre southwards, while in northern France and in Germany a greenhouse, a polytunnel or a warm south facing wall makes the difference, and planting out should wait until after the mid May cold snap.
Fertilização
Work two to three kilos of well rotted compost into each square metre before planting and add a handful of wood ash to top up potassium. Once growth is away, feed with a liquid organic fertiliser every two or three weeks, moving from a balanced formula to a higher potassium one as cropping begins. Avoid excess nitrogen, which gives lush leaves, a poor crop and a lot of aphids.
Rega
Water regularly until the fruit reaches full size and then cut back sharply. Carrying on watering during ripening is the mistake that ruins most melons: it gives bland, split fruit. The last two weeks should be almost dry. Always water at the base, never over the leaves or the fruit.
Controlo de Infestantes
The critical period is the first month, before the foliage covers the ground. Hand weed in that phase and, once the vines start to run, stop disturbing the soil: from then on the plant smothers weeds itself. A straw mulch under the foliage keeps the fruit clean and dry and greatly reduces losses to rot where fruit touches the soil.
Controlo de Pragas
The main pests are aphids, red spider mite, thrips and whitefly, and on young plants slugs and snails, which can cut down a newly emerged seedling in one night. Protect the seedlings with a cut bottle or an ash barrier for the first weeks. Against aphids and whitefly use potassium soap in the late afternoon; against red spider mite, which appears in dry heat, wet the leaves in the morning and use neem oil.
Doenças
Powdery mildew is practically unavoidable and shows as white dust on the upper leaf surface, above all from midsummer on. It is checked with potassium bicarbonate or sulphur applied at the first signs, together with removal of old leaves and good airflow. Cucurbit downy mildew gives angular yellow patches bounded by the veins and thrives in coastal humidity. Anthracnose and collar rot appear in waterlogged soil. Use a four year rotation and clear all crop debris at the end of the season, because that is where the fungi overwinter.
Colheita
Ripeness is read from the aroma at the end opposite the stalk, the change in ground colour and, in netted types, the stalk starting to crack and slip on its own. A melon picked too early never ripens or sweetens after cutting. Slide a tile, board or straw under each fruit to keep it dry and clean. Allow about 70 to 80 days from transplanting to the first harvest of this variety. The reference colour is dark green and grey skin, with orange flesh, and that is what tells you it is ready.
