But as leaf said, it's unnecessary to go camping in Herblore Habitat just to make potions. I make them every week to gain an instant bonus XP bonus for RS gold discovering all the jadinkos from 10/13 and any seeds that I discover that will be planted and used.
They only last less than a minute therefore the best method I've found to get every patch with one dose of potion is to get close to Trollheim patch, consume one juju-based dose in a pot, repeat step, Ectophial transfer through Port Phasmatys run to patch, REPEAT STEP, cabbage port (explorer ring) to Talkative patch REPEAT STEP Cloak teleport to Ardougne Farm Repetition Step, Camelot tab run through to Catherby patch, repeat step. This leaves little time to explore the scenery, so you should leave refilling buckets, talking and so on until until after you've collected Catherby.
The Repeat step is one of the easiest to harvest(or the clear case if they've passed away), super compost transplant the herb and record the ones you've harvested using the leprechaun. I employ the Camelot Teletab and leave Catherby at the end to utilize minimal inventory space in the event that I fail to replant , I'm able to go back to (most or all) the other plants with an easy , free teleport. It's also the closest to a bank and makes it easy to clear inventory or get the items you've left behind
Additionally, for Trollheim, it's worth having the rock climbing shoes on just in case, should you plant more than two varieties of seeds, you should always go with your top or most expensive. If he's got membership and powermines on living rocks with the 16 lvls difference You have no chances, but if he's intends to powermine iron until 99, he'll likely get up to 99 dung first.
16 levels isn't a ton of exp below that of the levels around 70. It is necessary to mine 77 levels for concentrated coal, and you should put it in a bank rather than powermine. Gold Concentrated is level 80. If he does have one of the dragons it's going to be a tight race, if I'm not mistaken. Exp rates shouldn't be serverely different, however if you have a strong team I'm betting you'll get it first.
Yes its alot of xp because dung can be slow in levels lower than 70. Furthermore, powermining is significantly faster. That's the reason I said he stands zero chance of success if poweredmining at Level 70 is under 1 million exp. You require 13 million exp to achieve 99. The cheap OSRS gold first 1m (even as high as the first 6m) does not make one thing, but at 80, the miner has reached his optimum exp rate, which is just under 100k per hour.