I don't think I have long enough sun in my yard to grow tomatoes or watermelon. I know I can grow tomatoes in a container, and I saw your article on watermelons that says the same. Instead of creating a hammock system for the melon, can I just let the vine spill out onto the ground (or deck)? I get lots of sun on my deck, and I think they would like it there.
Yes, you can do that. When the melons form, place some straw under them to keep them from rotting, but they will grow fine if left to grow across the ground.
How do you germinate a watermelon seed?
This article will help:
https://www.gardeningknowhow.com/garden-how-to/seeds/cheap-seed-starting-how-to-germinate-seeds-at-home.htm
How are the vines nourished? How are the additional watermelons nourished? What purpose do the tendrils serve?
Watermelons do best when they are given a slightly higher amount of phosphorus than nitrogen. This helps in the melon fruit development.
The tendrils are there because in its native environment, the vine would climb up objects to get more sun. The tendrils allow it to climb.
The plant started to flower but it drops the flowers after they open. Since the fruit is supposed to follow the flower, does this this mean that I will not get fruit? Please help, don't know what I'm doing wrong. Thank you so much for your advice.
This is common for melons and squash. These plants produce male and female flowers. In the beginning of the season, they will produce more males than females. The males cannot make fruit as they are only for pollination and they fall off the plant.
This article will help you identify the females from the males:
https://www.gardeningknowhow.com/edible/vegetables/squash/female-male-squash-blossoms.htm
If you find the females falling off, this is a pollination issue. This article will help you with that:
https://www.gardeningknowhow.com/edible/fruits/melons/hand-pollinating-melons.htm
Could you provide details on soil, type of plant food, etc. for growing a good watermelon for Zone 7?
Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/fruits/watermelon/growing-watermelon.htm
Watermelons can grow in many kinds of soil, but prefer a light, sandy, fertile loam that is well-drained. Add generous amounts of manure, compost, or other organic matter to enrich the soil as well.
I have long vines going all over the garden. They are flowering out but still cannot see any baby watermelons. When will they start developing?
Melons have male and female flowers. The male flowers cannot produce fruit, so they just fall off. They will produce more male flowers early on and then female flowers later. This article will help you pinpoint which are male flowers and which are female flowers.
https://www.gardeningknowhow.com/edible/vegetables/squash/female-male-squash-blossoms.htm
If you are seeing female flowers fall off, then it is a pollination problem and you may need to hand pollinate. This article will help with that:
https://www.gardeningknowhow.com/edible/fruits/melons/hand-pollinating-melons.htm
Is fertilizing needed during the growth of the vines?
No fertilizer is necessary; however, adding compost to the soil when planting will provide any additional nutrients. Here's an article that will help: https://www.gardeningknowhow.com/edible/fruits/watermelon/growing-watermelon.htm