Genus guide
Lactuca — 17 species
Part of the Daisy & aster family family (Asteraceae)
Lactuca is a cool-season leafy genus best known for cultivated lettuces — Butterhead, Romaine, Loose-leaf, and others derived mainly from L. sativa. Plants prefer full sun to partial shade, ideally six hours of light daily, with afternoon shade appreciated during warm spells to delay bolting. Keep soil consistently moist; uneven watering leads to tip burn and premature flowering. Optimal growing temperatures sit between 60–68°F (15–20°C). According to the ASPCA, lettuce is non-toxic to cats and dogs, making the entire genus pet-safe.
All Lactuca species we cover
- Batavian Lettuce
- Butterhead Lettuce
- Butterhead Lettuce
- Cos Romaine Lettuce
- Forellenschluss Lettuce
- Iceberg Lettuce
- Iceberg Lettuce
- Lettuce
- Little Gem Lettuce
- Lollo Rosso Lettuce
- Loose-leaf Lettuce
- Merlot Lettuce
- Oak Leaf Lettuce
- Red Romaine Lettuce
- Red Sails Lettuce
- Romaine Lettuce
- Webb's Wonderful Lettuce
Lactuca — frequently asked questions
Are Lactuca plants toxic to cats and dogs?
Most Lactuca are pet-safe. Of the 17 Lactuca species we cover, 17 are non-toxic on the ASPCA list and 0 carry a toxic or mildly-toxic rating. Even so, confirm the individual species before trusting it around pets.
How much light do Lactuca plants need?
Most Lactuca do best in direct sun. If yours stretches toward the window or loses its variegation it wants more light; scorched or bleached leaves mean it is getting too much direct sun.
Are Lactuca easy to care for?
Some Lactuca suit more experienced growers — several want strong light, sharp drainage or a specific seasonal rhythm. Check the individual species page for the exact regime.
How many Lactuca varieties are there?
Growli's care library covers 17 Lactuca species and varieties — browse them all above. They share a similar light, water and soil pattern, so once you learn one Lactuca, the rest follow closely.
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