"Essential Plant Elements ." Hort Americas , Hort Americas, hortamericas.com/blog/tech-doctor-steve/essential-plant-elements/. Accessed 12 May 2023.

Mulvihll, Renee F. "The 11 Best Seed Starting Trays of 2023 to Help Kickstart Your Garden." Better Homes and Gardens, Dotdash Meredith, 1 Mar. 2023, www.bhg.com/best-seed-starting-trays-7152591.

Safer Brand. "Learn the Six Plant Growth Stages." Safer Brand, Woodstream , www.saferbrand.com/articles/plant-growth-stages. Accessed 12 May 2023. 

Department of Primary Industries. "Plant Nutrients in Soil." NSW , www.dpi.nsw.gov.au/agriculture/soils/soil-testing-and-analysis/plant-nutrients.