Hard wood farming is in a nice spot right now. The main niggle is the inconsistency on their growth due the oddities from the Farming timer, a legacy piece of program code pre-dating even the 3 years ago era of RuneScape. We've undertaken a complete rewrite of the whole Farming timer program, aiming to make the growth rates more consistent. This is now within testing; we're not really predicting an exact day for it, since it's a rather large thing to test and debug, but we hope to provide you with this Runescape 3 Gold improvement through the end of the year.
Seaweed farming features a solid number of people producing it, though we notice that many gamers aren't using it instead for regular Seaweed with the Lunar mean 'Glass Make'. This particular seems to be because the XP given for utilizing it assumes only 2 piece of soda ash are used, rather than the 6 that it is worth. This is a bug, and it will become fixed, though we are going to avoiding changes in order to XP rates half-way through the King from the Skill competition.