Q.White Desert Rose Seedling
I have about 50 desert rose seedlings that I grew from seed from the pond of my desert rose plant. Eleven of the seedlings are white, or pinkish-white. Does that mean they are going to die? They are about 3 weeks old and look just as strong and healthy as the normal seedlings. How old should they be before I try grafting them?

Certified GKH Gardening Expert
Those seedlings are likely just not filled in yet. They should gain their color fairly quickly.
Grafting can be done when the seedling is about 1 cm in diameter. It should be noted that seedlings are usually faster than grafting in this specific case. I would only use the strongest of the seedlings for this purpose.
Here is an article for more information on the care of Adenium:
https://www.gardeningknowhow.com/ornamental/flowers/desert-rose/caring-for-desert-rose-plants.htm