A pot experiment was carried out to study residual effect of organic manures on growth and yield of spinach. Organic manures were prepared from weeds like Parthenium, Cassia and Ipomoea. These manures and chemical fertilizers were supplied to the pot. The growth analysis, was recorded after 40th days. Samples of each treatment along with control were kept in oven for estimation of dry matter, nitrogen, crude protein. Percent increase over control and nitrogen efficiency ratio was also calculated. All organic manures showed good residual effect on growth and yield of spinach organic manures prepared from weed increased the productivity of crop and show long term effects.