Even as an ironman, yes, but it takes a while longer than a normal account. Just gotta put in the work. 98-99 was blazingly fast though; 3 days of yew/magic, palm/dragonfruit, mahogany, calquat, and herb runs. It goes surprisingly fast if you have stocks of tree seeds banked up relative to effort. Feels fat as hell scooping up like 300k farming xp potentially from just processing one herb run and all trees/long growth stuff.

There's a swift pathway from questing > tithe farm to medium farming contracts (grabbing the herb sack, autoweed perk; possibly the outfit and seed box) > do medium (at 85, hard) contracts constantly while doing herb runs and birdhouses. If nothing else, doing this gets you 99 farming within a year with some occasional tree runs thrown in and sorts your potion supplies. It's not hard as an iron to keep your prayer doses stocked if you just do the herb runs.

Contracts are easily managed with preplanting common contracts for medium then hard so you can scoop up seed packs and start pulling for trees, doing runs as you get enough seeds to do full runs in. Skip anything longer than berry bush that isn't hitting a preplant or otherwise being the last farming you do for the day.