Quick answer: Meyer lemons are smaller, rounder, and sweeter than regular (Eureka or Lisbon) lemons, with thin, barely-there pith and a floral, almost mandarin-like flavor. Regular lemons are more acidic, more tart, and hold their shape better under heat, which is why most cooked and baked recipes are written for them by default.

The short version: a Meyer lemon is a sweeter, more fragrant, thinner-skinned cousin of the lemon you’ll find in most grocery store bins, and while you can usually swap one for the other, the recipe will taste noticeably different depending on which you use.

Where they come from

The lemon you buy most often, sometimes labeled Eureka or Lisbon, is what most people mean when they say “lemon.” The Meyer lemon is a different plant entirely: a citrus hybrid that originated in China and is believed to be a cross between a regular lemon and either a mandarin orange or sweet orange. It was brought to the US in 1908 and later refined into the disease-resistant variety most commonly grown today.

Appearance

Set them side by side and the differences are obvious:

Regular lemon (Eureka/Lisbon) Meyer lemon
Shape Oval, slightly pointed at the ends Rounder, more like a small orange
Skin Thick, bumpy, bright yellow Thin, smooth, deep yellow-orange
Pith Thick white layer Barely any pith
Flesh Pale yellow Darker, almost orange-yellow

That thin skin and minimal pith are also why Meyer lemon peel is more commonly eaten raw or candied, something you’d rarely do with a regular lemon’s thick, bitter pith still attached.

Flavor and acidity

This is the difference that actually matters in the kitchen. Regular lemons are highly acidic with a sharp, mouth-puckering tartness. Meyer lemons are moderately acidic and noticeably sweeter, with a more floral, almost herbal or spiced aroma that some describe as closer to bergamot than to a standard lemon. Because they’re less acidic, Meyer lemons alone won’t always deliver the same sharp brightness a recipe is counting on.

When to reach for which

Use a regular lemon when:

Use a Meyer lemon when:

Substituting one for the other

If a recipe calls for regular lemon and you only have Meyer (or the reverse), you can generally swap them 1:1 by volume of juice, but expect the result to lean sweeter or more tart than intended. A common fix when using Meyer in place of regular: add a touch more juice than called for, or reduce added sugar slightly, to compensate for the lower acidity. Going the other direction, regular in place of Meyer, a small pinch of sugar can round out the sharper tartness.

Availability

Regular lemons are stocked year-round in nearly every grocery store. Meyer lemons are more seasonal, generally best from December through May, and more often found at farmers markets or specialty produce sections than in a standard bin. If you spot them in season, they’re worth grabbing for anything where lemon is meant to taste bright and floral rather than sharply sour.