Growing melons on the balcony is a great idea, but they are not growing well, and the flower friend is anxious.
The leaves of the Green Treasure melon grown by a flower friend at home have all withered, and they do not know where the problem lies. According to his description, he used a 32 cm flower pot, the soil mix was garden leaf mold plus river sand, and the temperature here is 22-32°C. 2. Usually it grows quite well, but after flowering and fruiting, most of the fruits did not seem to swell. Two days ago, some leaves wilted, usually the leaves of the same seedling, and the leaves of other seedlings also do not look lively. 3. Usually a quick-acting granular fertilizer is used once about every 20 days, and watering is done with fermented fertilizer water from melon and fruit peels plus potassium dihydrogen phosphate diluted for watering.
The flower friend's melon seedlings
Another case analysis. To be honest, this kind of problem is also the hardest to answer. When talking theory, everyone can speak eloquently, so for theoretical matters, answers can be found on Baidu. No matter how the wording is changed, explaining around theory will not go wrong. However, case analysis is much more troublesome. Below are just a few personal views, and corrections are welcome for any shortcomings.
From the photos, your melons have the following problems: 1. Watering is not timely, 2. Soil fertility is insufficient, 3. They may be diseased. 4. The fertilizer water is too strong and has burned the seedlings.
From the plant growth, it really is not growing as well as you described. Looking at the soil in the pot, it clearly has little fertility, and in the description it says the soil mix is garden leaf mold, but it cannot be seen, and even if there is some, it is probably very little. Therefore, personally, I suggest adding some organic fertilizer. This will not only increase soil fertility, but also increase soil permeability and help growth.
The flower friend's melon seedlings
As for watering, personally I think the melons are still growing fairly well, and the wilting feels more like insufficient water supply, with the potting soil unable to provide enough water. Now the summer weather is relatively hot, and the transpiration rate of the soil and melons is relatively fast, so watering needs to be timely.
The flower friend's melon seedlings
From the leaves of the pumpkin, there seem to be slight disease spots, so spraying a little carbendazim can be considered.
The last thing to mention is watering with fermented melon and fruit peel water. This kind of water has too much fertility, so this method is not recommended. Occasional watering is fine, but if watered every day, it is not only easy to overwater, but also prone to burning the seedlings.
The above analysis is for reference only, and corrections are welcome for any shortcomings. As for the problems the poster encountered, it is probably still necessary to combine them with some of the problems you have encountered and solve them in a targeted way. After all, I have only looked at the photos.