Frit pudica here is in a similar situation albeit without the clay. It is in a raised bed in very gritty loamy compost with south exposure. The bed gets minimal supplementary summer water as it is on the fringe of the sprinkler zone that keeps part of the bottom of the woods from drying excessively if we have a real drought. I moved some bulbs to an organic based bed and they were gone within the year. J. John T Lonsdale PhD 407 Edgewood Drive, Exton, Pennsylvania 19341, USA Home: 610 594 9232 Cell: 484 678 9856 Fax: 801 327 1266 Visit "Edgewood" - The Lonsdale Garden at http://www.edgewoodgardens.net/ USDA Zone 6b