The effects of seagrass cover and nutrients on seaweed cultivation were examined in tidal pools in Tanzania. The seaweeds Eucheuma denticulatum and Kappaphycus alvarezii were cultivated from August 2006 - August 2007 in pools with and without seagrasses, and with and without added nutrients. Growth rates of fertilised E. denticulatum were significantly lower in the presence of seagrasses (P <0.05) but there were no significant differences (P >0.05) in the rest of the treatments. Monthly growth was lowest during the hotter months (December-February) and heavy rains (March-May), and highest during the cooler months (June-August).