The main stevia downsides are a licorice-like aftertaste, poor results in baking, and seeds that sprout slow and uneven. None of these stop you from growing or using it. They just shape how you handle the plant and where it fits in your kitchen.
The flavor problem shows up fast in a hot drink. Steep a few fresh leaves in tea for a minute and you get a clean sweet cup. Leave them in too long and that same cup turns faintly bitter. This stevia aftertaste is the trait most people notice first. It is real, but it sits at the easy end of the stevia downsides because a light touch keeps it in check.
The aftertaste comes from the plant itself. The sweet taste lives in compounds called steviol glycosides, and a few of them carry a bitter, licorice-like edge. Over-steeping or using a heavy hand pulls more of those compounds into your drink. I always pull the leaves early and use a light pinch, which keeps the flavor clean and the bitterness out.
Baking is the second big limit. Sugar does two jobs that stevia cannot copy. It browns and caramelizes under heat, and it feeds yeast so dough can rise. Stevia gives you sweetness and nothing else, so a cake made with it alone comes out pale, flat, and dry. Most stevia baking problems trace back to this one gap.
So keep sugar in the recipe when texture matters. I prefer to swap out only part of the sugar for stevia and leave the rest in to do the heavy lifting. A common starting point is to cut about a third of the sugar and replace its sweetness with stevia. You still trim some sweetener, but your cookies brown and your bread rises the way they should. For tea, smoothies, and chilled drinks, plain stevia works fine on its own with no sugar at all.
The grower-side issues are worth knowing too, since the stevia downsides are not all about taste. Stevia seed germination runs low and varies a lot from batch to batch, so a packet of seed often gives you only a handful of plants. Even fresh seed can leave you waiting two or three weeks for a thin, patchy stand. The fix is simple. Skip seed and take soft cuttings from a healthy plant, or buy a started one. Cuttings root in a couple of weeks and grow true to the parent.
Cold is the other catch. Stevia is frost-tender and dies outdoors once temperatures drop below freezing. It survives winter in the ground only in USDA zones 10 to 11. Everywhere colder, you grow it as an annual or keep a pot you can move indoors before the first frost. I bring mine inside each fall and take fresh cuttings to carry the plant through to spring.
- Aftertaste: Expect a licorice-like edge if you over-steep or overuse it; small amounts of dried leaf taste cleanest.
- Baking: It will not caramelize, brown, or help dough rise, so it cannot fully replace sugar in baked goods.
- Germination: Seed sprouts slow and uneven, so cuttings or a started plant are the dependable route.
- Cold sensitivity: Frost kills it outdoors below USDA zones 10 to 11, so grow it as an annual or overwinter pots indoors.
Weigh these stevia drawbacks against the upside. You get a sweet, calorie-free leaf you can grow on a sunny sill or patio. Use a light hand and dried leaf for clean flavor, keep sugar in your baking, and grow from cuttings instead of seed. Do that and the downsides mostly fade into the background.
Read the full article: Stevia Plant: Grow, Harvest, and Use It
