This is my first year growing plants indoors. I started growing Petunias, and I now have seedlings that are growing pretty quickly. As you can see in the picture, they are not all the same height. How can I tell when they get their first set of true leaves, and when should I use fertilizer and how often? Also, is there a certain type of fertilizer you recommend?
Thank you
In general, once seedlings get their true leaves, they have about used up the food in the seed, and that's when I'd start fertilizing, at 1/4 the amount recommended on the label (of whatever fertilizer you choose)... I don't fertilize every time, either, which is more by chance then by design. The exception to this is growing tomato seedlings, which seem to do better when I follow Carolyn Male's recommendation to avoid fertilizing until planted out.
