The 'compost' group
These nouns refer to substances in which plants grow, or substances which are added to soil.
compost manure mulch potting compost soil
Half fill the bowl with moist compost and plant several bulbs.
For this I made up a compost of decent loam, peat and grit.
Nearly all the peat-based and soil-based composts sold in garden shops contain chemical fertilizers and are thus not organic.