5 2008-07-21T12:48:12+10:00 false I got some hybrid iris tubers from a friend about 5 years ago. They continue to multiply each year, but of about 40 plants only 5 ever bloom (the same five each year.) They get afternoon sun. Should I fertilize? and with what kind of fertilizer? Or what else could be wrong with them? I live in zone 3-4 in Minnesota. 0 false 23795 false false true Question 11080 Planting 2008-07-21T10:00:00+10:00 DMY Public 2008-07-21T12:48:14+10:00 848