The options are pretty self explanatory, but to give you some examples from my own lists, you can now:
Group by Genus: This will display your list grouped by each genus your plants belong to. See my list for an example.
Group by Lifecycle Type: This will group your list based on the lifecycle of each planting (Annual, Perennial etc.) See my list for an example
Group by Category: This will group your plantings based on the plant category (Vegetable, Herb, Succulent, Tree etc.) See my list for an example
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