Mine, does that too. They green up after they get a bit older.

Quite normal for a cara cara; I have 8 and all the new growth starts at that color. On the question of fertilizer, since your older leaves look to be a bit light on micro-nutrients, and your tree is blooming, I would give it a shot of a good citrus fertilizer. I fertilize most of my citrus the first week of January, May, and September... and for insurance policy, I give them a shot of chelated minerals in July.

What cayden and John said. Very normal for new citrus flush to be this color. This is the time to fertilize, so a good citrus fertilizer application, and then if you have CLM issues in your area (Citrus Leafminer), consider treating now with a systemic, or begin spraying starting at the end of June/beginning of July. You can search our forum for "CLM" to see treatment options (discussed at length on the forum).

Patty S.

mine is like that too