Marrows can be started later than giant pumpkins and squash. They do not need as much time to grow. The best time to start is early May. The seeds do not need soaking ahead of time. They usually germinate quickly at just room temperature. In general, marrows like it a bit cooler than pumpkins. Make sure the pot is big enough to hold the plant for a few days. Once the first true leaf appears, you can transplant it outside as long as there is no danger of frost. The plant will always grow in the opposite direction of the first true leaf.
It is smart to start your plant off in a hoophouse which will keep it out of the wind and protect it from low temperatures. Make sure the hoophouse is ventilated during warm days. The hoophouse should be twice as long as wide, because the main vine of a marrow plant grows much faster than the side vines. As the weather warms up, remove the hoophouse as marrows do not appreciate hot temperatures and will not thrive in a hot greenhouse.
Slugs really like young marrow plants (especially freshly pollinated marrows), so make sure you prevent them from attacking your plants.
Some growers who have properly prepared their soil, do not add any fertilizer during the entire growing season. The 2009 world record was grown this way. In general, they need the same feeding and watering as pumpkins. Like pumpkins, they do not appreciate water on their leaves, especially during the day. This can lead to scorching and can contribute to the spread of powdery mildew.
The soil should never be soaking wet or dry. Both can lead to irregular growth and splitting. Marrows seldom or never have stem stress, but do suffer from rib and blossom end splits.
Once the fruit has started to grow, you can feed with a higher potash fertilizer up to two times per week.
Leek belongs to the Allium family, which is the same family as onions and garlic. There are basically two types of leeks, the long blanche variety and the short pot variety. For competition purposes the pot variety will become much heavier, though shorter. While better strains are produced from seed this takes several years and it is best to grow with bulbs, pips or grass taken from a known heavy leek (they are a clone of the mother plant, but grown under better conditions can be heavier). These also allow an earlier start to be made in the season as they ideally require a 10 month growing period.
Leeks are weighed with the washed roots on. The entire plant must be clean, dry and free of foreign matter. It must also be in sound condition.
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One "biological masterpiece," the sea slug Elysia chlorotica, is able to conduct photosynthesis by extracting DNA and chloroplasts from its plant food source.