Farming Guide for Watermelon Plantation
Family Name : Cucurbitaceae Botanical name: Citrullus Lanatus
Growing watermelons requires lots of space, lots of sun, lots of water and lots of nutrients. They are greedy, rambling vines, like all plants in the cucurbiteae family (e.g. zucchini, squash, pumpkin, cucumbers)Watermelons are not particularly difficult to grow, but because they are so demanding, watermelons are not a good plant for beginner gardeners. It is also not a good plant for anyone with restricted space, water, or average soils.
In the true tropics the dry season (winter) is the best watermelon growing season. Watermelons do not cope well with extreme heat or the humid, soggy conditions of our wet season/summer. Fungal diseases and bugs will wipe them out in no time. If you live in a cooler climate, then summer is the time to grow watermelons. You do need at least three months of reliably hot, sunny weather to grow and ripen a watermelon. During that time your average daily maximum temperature should be at least about 20-25°C or 70-80F. Warmer is even better.
(There are different watermelon varieties, so if you are at the low end of that, look for a faster maturing variety.) Grow watermelons in full sun. You also need an abundant supply of water and nutrients (good soil).
And you need space. as it is a rambling vine. They like to go wandering and smother everything around them.
Growing watermelons from seed
Watermelons are grown from seed. You may be tempted to use seed out of a melon you bought, but don’t waste your time. It is almost guaranteed to be a hybrid. Hybrid varieties are very special crosses that don’t grow true to type. (You would end up growing what is called pig melons. A melon variety that’s only good for feeding to the pigs)
Buy your seed, and if possible buy an open pollinated heirloom variety. Because then you CAN use your own seed next year. The open pollinated varieties are also hardier. You will find a lot more interesting varieties amongst the heirlooms then you can find in the standard collection of you local gardening centre. Start your watermelon seeds in the ground, right where they are supposed to grow. The soil should be at least 18°C for them to germinate.
Buy your seed, and if possible buy an open pollinated heirloom variety. Because then you CAN use your own seed next year. The open pollinated varieties are also hardier. You will find a lot more interesting varieties amongst the heirlooms then you can find in the standard collection of you local gardening centre. Start your watermelon seeds in the ground, right where they are supposed to grow. The soil should be at least 18°C for them to germinate.
Growing watermelon plants
Slugs and other seedling chomping critters like mulch and they like watermelons. Wait until the watermelons have outgrown the most vulnerable stage (where a slug can demolish them within minutes). Then mulch the area well.
Watermelons have very shallow roots and they need lots of moisture. The soil should never dry out, and mulch helps with that.
Watermelons have very shallow roots and they need lots of moisture. The soil should never dry out, and mulch helps with that.
Mulch also keeps weeds down. Weeding could disturb the shallow roots, so it’s better to not let them grow to start with. Watermelons are VERY hungry plants. If your mulch is something like compost or aged animal manures, all the better. (Like all cucurbits, watermelons can handle fairly raw compost and manures.) Otherwise, feed your watermelons regularly with something like pelleted chook manure or another organic fertiliser. (Ideally you should use a high nitrogen fertiliser in the early stages, but cut back on nitrogen and give them lots of potassium once they flower and fruit.)
When the vines are about two metres long, pinch out the tips. It encourages branching.
As your watermelon vines grow bigger they will start trying to take over more space. If they start to smother other things you can remind them about sticking to their area by gently moving the tips of the vines, so they grow into the right direction.
Watermelon flowering and fruiting
Watermelons grow male and female flowers on the same vine.
The smaller male flowers appear first. The female flowers are much larger (see the photo) and you can’t miss them.If you don’t see any it could have several reasons: too hot, too cold, not enough water, not enough nutrients… In any way, it means the watermelon plant isn’t happy.
If the plant does produce female flowers but the little fruit at the base of it shrivels up and dies, then the flowers are not getting pollinated.Watermelon flowers are insect pollinated. If you suspect the insects aren’t doing their job, you can do it yourself, just to be sure.Hand pollination is best done early in the morning. Pull off a few male flowers and remove the flower petals. Then brush the pollen laden stamen against the stigma in the centre of the female flower, so the pollen sticks to it. Easy.The first few female flowers on each branch will give you the best fruit.To grow them as large as possible you can pinch out the tip of the branch after a couple of fruits have set (are starting to swell up).But this isn’t an essential step. You can also just let them go…
Problems when growing watermelons
The biggest watermelon pest are the leaf eating beetles (they damage the flowers, too) like spotted and striped cucumber beetles, pumpkin beetles with or without dots, whatever you want to call them.Those orange thingsThey all look similar and all do the same: chomp away on your watermelon plants…
However, if they become a real problem it is mainly a sign that your watermelons are stressed.
A healthy watermelon in a balanced environment and in good soil should not attract too many beetles. Also, a watermelon should grow fast enough to cope with a few beetles.
The other main problem with growing watermelons is mildew, a fungus that makes the leaves look as if they were coated with white powder. The fungus thrives in damp, humid conditions.
The best you can do is to avoid getting the leaves wet. If you can’t avoid overhead watering, do it first thing in the morning so they dry quickly. Never wet the leaves in the afternoon or evening.
In the tropics you probably won’t be able to control the beetles or the mildew, once the build up for the wet season starts. And it isn’t worth it anyway… The oppressive heat and the humidity just aren’t good conditions for growing watermelons. Grow something that likes humditiy and wait for the next dry season to grow watermelons again.
Watermelons are mainly cultivated in Maharashtra, Karnataka, Tamil Nadu, Punjab, Rajasthan, Madhya Pradesh, and Uttar Pradesh.
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