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Identifying Initial Downy Mildew Symptoms in Cucurbits Is Critical for Successful Management

Powdery Mildew of Cucurbits


The Giant Marrow is a marrow which belongs to the Cucurbita family ( cucurbita pepo ). The Giant Marrow grows as an Annual and is a Fruit with  a vine that grows to a length/width of approx 4 meters x 4 meters. Giant Marrows are very similar to grow as the smaller varieties of pumpkins, but they grow a lot larger than any normal varieties.

Preparation: To prepare the soil for your Marrow patch, care should be first taken to select the correct piece of land. It should be well drained, sunny but in a wind protected area. The ground should be turned as early as possible, with manure or some other type of food (i.e. a legume such as oats or chick peas) added to give the ground nourishment and compost.

Planting: There are three options when planting giant marrows. Firstly, the seeds can be planted into a good seed raising mixture, until 2-3" high. Care must be taken when transferring the small plant and its roots into the ground. The second option is germinate the seeds in a humidifier (heated fishtank or similar  device) then transfer the germinated seed to a growing pot. The third option is to plant the seeds directly into the ground.

The most important thing when planting a giant marrow seed is DO NOT OVERWATER the ground/pot until the seed has germinated. Too much water will rot the seed. The soil should be kept no more than DAMP until the seed has germinated.

When to Plant: Giant Marrows are usually planted around the same time of year that smaller variety pumpkins are planted in your area. They do not like frost, so care should be taken to avoid the last frost, if you must plant before frosts are finished for the year, protect the young plant. In Southern Australia, the best time to plant is September to November. In Northern Australia, growing seasons are often different and can be grown through the Australian winter, check locally best growing times.

Basic Requirements: The Giant Marrow seedlings should be watered regularly, as should the more mature plants. Great care should be taken in humid conditions not to over-water the plants. Giant Marrows can rot very easily. The plants should receive plenty of sun, but again they get sunburn, so you may need to lightly cover the plants, but make sure there is room for air movement underneath.

Growing Time: A Giant Pumpkin takes approximately 5 months to grow. It takes approximately 70-90 days before any fruit appear on the vine. It then takes another 60 days or so for the fruit to reach maturity. It is recommended that only 1-3 fruit be left on any one pumpkin bush and only one per main vine. The more fruit, the more competition for food.


Pollination: Pollination is a key factor in growing Giant Marrows. If a Marrow grows and only reaches the size of a large Zucchini  and then dies off, it means the fruit was not pollinated correctly. Another option is to hand pollinate the male flowers with the female flowers. The best time for this is early in the morning.


Maturity: A Giant Marrow is mature when the skin of the Marrow hardens off and begins to look a bit rough. The colour sometimes changes and fades when this occurs. A giant marrow will only last about 4 months once cut off the vine. You should never cut a giant marrow off the vine until it is ready for competition, or if you think rot or disease may kill the fruit early if left on the vine.

Identifying Initial Downy Mildew Symptoms in Cucurbits Is Critical for Successful Management

Powdery Mildew of Cucurbits


Copyright 2016 Atlantic Seeds  Last Updated 14th March 2016