How to Say "soil" in Spanish
The most common Spanish word for “soil” is “tierra” — use 'tierra' when referring to the earth or ground specifically as the medium for planting and growing plants..
tierra
/TYEH-rrah//ˈtjera/

Examples
Las flores crecen en la tierra.
The flowers grow in the soil.
El niño se sentó en la tierra para jugar.
The child sat on the ground to play.
Compraron un gran pedazo de tierra para construir su casa.
They bought a large piece of land to build their house.
Using 'la'
Since 'tierra' is a feminine word (it ends in -a), you'll almost always see it with 'la' or 'una' before it, like 'la tierra' (the ground) or 'una tierra' (a land).
suelo
/SWEH-loh//ˈswelo/

Examples
El gato está durmiendo en el suelo.
The cat is sleeping on the floor.
Ten cuidado, el suelo está mojado por la lluvia.
Be careful, the ground is wet from the rain.
Este tipo de suelo es perfecto para cultivar tomates.
This type of soil is perfect for growing tomatoes.
Suelo vs. Piso
Suelo is the surface you walk on (floor, ground). Piso can also mean 'floor', but it's also used for an apartment or a level/story of a building. 'Vivo en el tercer piso' (I live on the third floor).
Tierra vs. Suelo: Planting vs. Floor
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