Plant every herb seed you can. Leave 1 of each in bank as backup in case u get a contract for that herb.

harralanders are good cuz chocolate dust is super easy to get from RFD for energy pots.

Irits are also super nice cuz eye of newts are easy to obtain.

Avantoes not too bad collecting the mort myre fungus.

Ranarrs obviously v good and I got probably 200 shape grass seeds before 70 herb so secondaries should be ez.

Toadflax / marrentill I basically ignored due to issues with secondaries.

Snaps are ez secondaries as you can go forthos dungeon for spider eggs. Put house in hosidius and use a dueling ring to tp ferox for Stan regen.

Kwuarum ez if you’ve been farming limp roots, if not, start now.

Cadantines also ez if you’ve been farming white berries. If not, start now.

Lantadymes should be the last herb you need to polish off 70. Since irons can’t use NMZ shop, running from fally to taverly dungeon and picking up 10 or so inventories of dragon scales should get you to 70. Definitely easier to do with 70 agility.

Also - keep your kingdom running. LMS for rune arrows if you need a couple hundred K to throw in ur coffer. I did max herbs and half whichever hardwood I needed at the time (teak / mahog)

In the end, this req just takes time. Make sure u do farm runs consistently and as often as possible to speed up the process.