Some rose growers report good results when it is used as a mulch. The dried, shredded remains of sugar beets after the juices and sugars are extracted are sold as organic fertilizer. They are rich in nitrogen. Corn gluten is a high-nitrogen fertilizer with the unique ability to inhibit germination of seeds. With it you can feed your lawn and prevent crabgrass at the same time.
Cottonseed meal is made from the remains of cotton seeds after the oil is pressed out.
It is a high-nitrogen fertilizer, but some growers have concerns about pesticide contamination of the meal. Cotton is a heavily sprayed crop, but pesticide-free cottonseed meal is available. The extracts or pulverized parts of several seas, including kelp, or algae are good sources of minerals, potassium, and sometimes nitrogen. Follow application directions carefully when spraying on leaves, because sea plants can affect plant growth when sprayed directly on leaves. For the best price, look for it at animal feed-supply stores.