First time poster and also a gardening novice looking for help.
Last summer, I planted a few loquat seeds in a small planter. (They came from a big loquat tree my neighbors have that grows right into my terrace) A few weeks later, and to my absolute delight the started growing and had been doing great. However a few weeks ago, they started looking a bit sad and weathered. Some leaves seemed to dry up, while others have spots. I've included pictures for reference. When the leaves look a bit placid I make sure to water them and this spruces them right up. I am not sure how often I should be watering them though, so am extra careful not to drown them.
Do you think the issues are a disease or more of a watering problem? If a plague/disease how would I go about haling the plants? If you think it's a watering issue, could you please direct me to how often, and in what quantities I should water them?
I'm located in Paris, France if you are wondering about the weather/seasons.
Thank you so much for your help. I really want these little trees to make it. (I planted them with my aging parents as a bit of a legacy thing too so I've really grown attached)
Have a great day!