I agree with Susan. I maintain an herb garden and grow a variety of herbs. The soil there is not the best as the drainage is poor. I keep mint in pots because of their invasiveness and I also keep lavender, Jamaican oregano, marjoram and Russian sage in large pots because they would eventually rot in the wet soil. I have a fig in a raised bed to keep it out of the wet soil but also to contain the roots longer.
I cannot grow too many perennial herbs because of the wet soil unless they are shallow rooted ( less than 10 inches). The deeper rooted plants will die from phythoptora when their roots go below a foot. I end up growing a lot of onions and annuals in the garden. Basil, sesame, perilla, culantro all reseed. I have to transplant them where I want them to grow and the ones growing between the pavers cannot be saved and have to be pulled out. I only want a few fennel for the garden, so I cut off the seed heads and that has kept them from spreading. Fennel tastes great, but is not friendly to other plants. Fennel is also the main protection for the herb garden. It is an aphid trap, but the ladybugs will lay their eggs there to feed on the aphids. Fennel blooms for a long time providing pollen and nectar to a wide range of beneficial insects like ladybugs, lacewings, tachinid flies, parasitic wasps, and bees.
I used to also take care of the medicinal garden, but it was too much work to take care of both the culinary and medicinal garden without help, so for a long time all we did was weed it once a month. Now, there is a medicinal hui that is doing that. They have a larger group, but they still primarily only work in it once a month.
I have a couple of people helping me in the herb garden and we work on it on most Fridays and some people will come in between and weed. Weeding is the biggest chore and my goal every week is to pull at least one large bag of weeds or fill the 55 gallon drum (same size as the bag). I have already dug up the arrowroot and I still have to dig up the horseradish. I have planted some of the garlic, but I still have space, so I am probably going to plant a few more. I have some peppers to decide whether to put them out in the garden or give them a decent burial and I have to replace the marjoram again. Turmeric and ginger are blooming but it will be a couple of months before I have to dig them up. I have to work on the irrigation system.
Herb gardens are usually not that hard to grow, if you select the herbs best suited for your climate and soil conditions or keep some of them in pots, but you will be spending a lot of time in maintenance.