Seedless Watermelons.

(image courtesy of War and Peas.)

Just the other day as we were looking at watermelons for the 4th of July, we wondered “how are seedless watermelons grown?” After all, there are no seeds in a “seedless watermelon.”

The internet comes to the rescue!

First off, seedless watermelons are not completely seed-free. There are some small, almost transparent, seeds to be found in the melon; they are unremarkable and edible. Occasionally, you will find a “true” seed in a seedless variety. Seedless varieties are hybrids and are derived from a fairly complex process.

Hybrids, if you remember, do not breed true from seed. You may end up with a mutt of a plant with a mix of traits. In the case of seedless watermelon, the seeds are actually sterile. The best analogy is that of a mule. Mules are a cross between a horse and a donkey, but mules are sterile, so you can’t breed mules together to get more mules. This is exactly the case with seedless watermelons. You have to breed two parent plants to produce the hybrid.

So how are they grown?

Seedless watermelon growing is much the same as growing seeded varieties with a few differences.

First of all, seedless watermelon seeds have a much more difficult time germinating than their counterparts. Direct sowing of seedless melons must occur when the soil is at a minimum of 70 degrees F. (21 C.). Ideally, the seedless watermelon seeds should be planted in a greenhouse or the like with temps between 75-80 degrees F. (23-26 C.). Direct seeding in commercial enterprises is very difficult. Over seeding and then thinning is a costly solution, as seeds run from 20-30 cents per seed. This accounts for why seedless watermelon is more expensive than regular watermelons.

Secondly, a pollinizer (a diploid) must be planted in the field with the seedless or triploid melons. A row of pollinizers should be alternated with every two rows of the seedless variety. In commercial fields, between 66-75 percent of the plants are triploid; the rest are the pollinating (diploid) plants.

In order to grow your own seedless watermelons, either begin with purchased transplants or start the seeds in a warm (75-80 degrees F.) environment in sterile soil mix. When the runners are 6-8 inches long, the plant can be transferred to the garden if soil temps are at least 70 degrees F. or 21 degrees C. Remember, you need to grow both seedless and seeded watermelons.

Dig holes in the ground for the transplants. Place one seeded watermelon in the first row and transplant seedless watermelons into the next two holes. Continue to stagger your plantings, with one seeded variety to every two seedless. Water the transplants in and wait, about 85-100 days, for the fruit to mature.

So there ya go!

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