Peatmoss

They do best in soils with a great deal of organic matter and the incorporation of peatmoss, bark, sawdusts and composts is usually advised.

Soil: A soil containing a fair amount of organic matter (leafmold, peatmoss or compost) is desirable. Since citrus plants prefer acid conditions, use peat in the potting mix to help keep the pH down.

Organic matter can consist of compost, well-rotted manure, or peatmoss. Spread a layer of organic matter 7.6-10 cm (3-4 in.) thick on the surface of the soil to be improved and then throughly incorporate the organic matter into the existing soil.

Do not incorporate organic matter such as peatmoss into backfill for individual planting holes.

Soil, whether it is clay or sandy, should be amended with organic material (compost, well-rotted manure, or peatmoss) to promote percolation and retention.

Cardboard boxes or newspaper
Grass clippings or other organic material
Quality soil
Peatmoss or shredded leaves
Seeds
Plant starts ...