You got it. You need 20 snowpearl gels to complete the maturing of your flower. Your friend needs 20 apple gels. So, you make apple gels for him and he makes showpearl gels for you, and two of you trade them. Make sure you don't complete one ahead of the other, because once flower is matured after 20 opposite gels, it gets harvested and you can't make any more gels for the other person.
-- Rustyx --- 92R / 92S / 92M on Reni (Guild KnightShift). Yes, running the new FOTM R/M, cause I am not elf enough to be WD/S.
Oh, and people who have more than 3 classes are clinically insane.