porcupine grass
... that the awns of porcupine grass drill its seeds into the soil?
... that the <a href="./Awn_(botany)" id="mwD_k" rel="mw:WikiLink" title="Awn (botany)">awns</a> of <b id="mwD_o"><a href="./Hesperostipa_spartea" id="mwD_s" rel="mw:WikiLink" title="Hesperostipa spartea">porcupine grass</a></b> drill its seeds into the soil?