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My Cantaloupes and Watermelon Stopped Growing

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Question:

We are giving growing cantaloupes and watermelon a try. We have had very hot and dry weather since we put the plants in a month ago, and have watered every day. We have several fruit started on the plants, but neither seems to have grown any the past 1 1/2 weeks, whereas they all had been showing noticeable changes every few days. (The fruit ranges from tennis ball size to large grapefruit size.) Is this normal?

Hardiness Zone: 8a

Tennie from Sherman, TX

Answer:

The state of Texas is always at the top of the pile for watermelon production in the U.S. That means that all things being equal, your chances for successful melon crops are better than that of the average gardener. There are three factors that will cause the growth of melons to come slow down (or stop): cool temperatures (below 60ºF), too much water or too little water. When melons don't get enough water they stop growing. Don't over-water them or the vines will collapse, but continue to keep them well watered like you have been doing and remember that the larger they get, the more water they will need. Allow the top 1 to 2 inches of soil to dry out between waterings.

Make sure you're using the right fertilizer. Use one with 4 parts phosphorus to 1 part nitrogen to promote larger vines and better fruiting. Ideally, this would have been added to the soil at planting time. Adding additional nitrogen after 1 month and again 2 months after planting will keep your vines growing.

Cool temperatures are probably not your problem. Although watermelons like heat, the extreme temperatures this summer have been hard on everything. You can help prevent any further stress to your melons by keeping the vines free of weeds. Melons don't like to compete for nutrients. Even small weeds can stunt their growth and result in smaller melons.

As long as the leaves and vines on your melon plants continue to look healthy, I suspect the slowdown in growth is probably only temporary. If you feel like you have a sufficient number of melons started, you can help to increase their size by removing any remaining flowers on the vines. This will channel all of the plant's remaining energy into expanding the fruit that is already there. Of course the final size of your melons will depend on what varieties you're growing.

Good luck!

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By Ryan (Guest Post)08/26/2007

I just started growing watermelon for the first time this year and everything was going good. When I went to check on it the other day it had split open. Why is that? If anyone can answer this that would be great because I'm a little lost.

By Jennifer,CA (Guest Post)08/03/2006

I think we're all having a poor veggie garden this year! My bees aren't doing their job with the zucchini. But they are with my tomatoes! Sometimes you have to self pollenate by using a Q-tip transferrring pollen to the flowers. I've done this...it works- but it's a chore!

Jennifer CA

By lynda [12]07/22/2006

Surprisingly I have a couple of cantalope out of a 3 3 x 3 foot "cage" garden I read about but didn't place enough or right ingredients into when starting.
However, I've been adding compost tea twice weekly and hope to save the whole suffering plant from the HEAT WAVE. Okra, peppers are doing great in same
garden but beans failed (virus, I'm sure) and squash
has done little to nothing although still alive. I water
almost daily since it has only cardboard for a lining
and a center "hole" of lava rock to add water/tea into. It's also my first try at any of these. I believe
the cage gardening is viable/do-able but needs the
proper 1/3 peat(don't know what kind, though),1/3
compost, 1/3 sandy loam to give it half a chance.
Also, I question how well the cantalope vine will do
on a TRELLIS, even though I've supported the growing fruit with 1/2 plastic jugs and some other
supports of plastic mesh/panty hose, whatever I have. I hope I don't have to abort the whole program
due to the HEAT and water shortage/rationing! @#$%$@#$% !!!

By jack (Guest Post)07/21/2006

my watermelon get to large grapefruit size , then split open long before size or ripe ?any thoughts?

By Carol in PA (Guest Post)07/20/2006

I've never grown these particular melons, but I'd think they require a lot of water. Watermelons are mostly water and sugar.

Can you fix up some type of drip irrigation? You know like a hose with tiny holes in it laid alongside the plants. Then leave the water turned on so the plants get watered really deep. I'd say 20 min or half hour per day.

I sure hope someone else can give you some feedback.

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