Unfortunatly he already has 99 herblore. Plant the best thing you can, if you want to make profit, make sure to to rannars at 32. You will have to get into the groove of planting, doing something else for a certain amount of time, then coming back, and getting your plants, re-planting, etc, be sure to do trees as soon as you can. Marigolds, right now can make you alot of money, but I'm sure your not concerened about making money. So erm... just plant.