Answer: If you plant in cold soils, the bulbs will rot so plant them after the soil warms - about the time you'd plant corn or beans (usually mid-May or early June). Plant them 4 to 6 inches deep in rich, moist soil. It is sometimes difficult to tell which end should go up. It takes a little bit of investigation and some guesswork. Look at the tuber, one end should have a little more "hairiness" to it. That is the end that should be planted down. Also, one end may be slightly more tapered/pointy. That end goes up. If you really can't tell, plant the bulb sideways--the roots will find their way down, the shoots up.
Q&A Library Searching Tips