Traditionally used for
Read enough herbal packaging and the same construction turns up everywhere. Traditionally used for — and then a condition.
It reads like caution. Historical framing, passive voice, no promise made in anybody's own name. It feels like the careful version of the sentence.
It is not a hedge
The framing does not change what the sentence does. A product that points at a condition has pointed at a condition, and wrapping it in history does not move it somewhere a supplement is allowed to go. The preamble is not the part that gets read; the condition is.
This was the favourite move of the copy we inherited. It is in almost every entry, and it is the single most common reason a line like ours has to be rewritten from the beginning rather than edited.
What replaces it
What the plant is, and what you do with it. Colour, scent, texture, temperature, the hour it suits. Steep it, float it, burn it, scatter it over something you baked.
The constraint turns out to be a gift. Traditionally used for is a sentence about a condition. Delete it and what is left is a sentence about a plant — and the plant was always the more interesting subject.