Description: Hakea stenocarpa It can be hard to work out the difference between Hakea and Grevillea plants. Hakea usually has a hard woody nut, but not all hold their fruit. It drops very soon after forming. This is one of them that drops its fruit quickly but it has lovely curly leaves. Fruit is the woody case which holds the seeds. - Being botanically correct here. :~) Part of the Carnaby cockatoo food plant series . Date: 13 October 2008, 10:01. Source: Curls and swirls. Author: Jean and Fred from Perth, Australia.