With the modifications to herb stacks so that they will now decay, herbalism and alchemy will be functioning differently. It has been a very common tactic for large herb stockpiles to be built up for the bulk alchemical providers so that they can always just make what they need, when they need it. This is no longer very feasible.
This means that there will be more pressure for "on demand" herbalism, which leads to more potential for shortfalls due to a mechanic which is of tremendous tedium to herbalists: Hibernation.
Hibernation is a mechanic where, every in-game month, at least one herb pile will "die out". No matter how many of that herb is in the room, it is possible for the whole stock to just fade away into death. Once the month ends, a handful of rooms might have survived the threshing. The month after hibernation, an herb will randomly grow in a small number of those rooms as well (a low % chance), and these can be used for replanting with.
To replant, you need to pick the herbs, take them to the new room, and plant them. If the herb you pick is out of the ground too long (or goes in your rift), it gets too "old" and thus cannot be planted- only a freshly picked herb may be transported. With Faeling balance bonuses I tend to do about 6 herbs at a time, but it's just long and tedious.
The only 'reward' for this is that now the herbs will be growing in all of those rooms. However, any other herbalist can take the full benefit of that work; if the room grows 10 herbs, and someone comes through and harvests them, I get nothing. I can but sigh at the screen and dejectedly slump at the keyboard.
So, there are a couple of ways to go here: 1) Adjust the shops to allow for herb stockpiles again, or 2) Adjust herbalism to make it less of a tedious and frustrating experience.
To adjust shops, the following idea could be implemented: i) Shop rifts can now hold up to 5k of any herb at a base level. Every shop expansion adds another 1k herbs to the capacity.
To adjust herbs, there are a few potential possibilities: i) Just rework hibernation. Instead of completely decaying, herbs could have their stockpile reduced, so that most rooms in the area will be reduced to 1 in the room by the end of the month. The month after hibernation, they could grow more slowly. However, what this would do is make it so that replanting is only necessary if someone actually strips the rooms (for which we have active counters, like Nature Guard). ii) Make harvesting easier. Ragniliff suggested the following: If a room is at 60 herbs, the first harvest might get 20 in one go. If the room is at 40, the harvest might get 15. If the room is at 15 or less, you'd just get 1 herb per pick. Basically this would make it more time efficient to only pick rooms with a large number of herbs, and picking the lower ones is hurting you and wasting your time. It actively discourages stripharvesting.
There are likely a number of other thoughts or ideas out there, so have at it!