Here's an article link from Libre, who says "I was speaking with a fellow at the bakery about composting, and what Emily told us about Daffodils. He said after you use the bulbs, and cut the flowers, you could dry the bulbs and use them as a fuel source, then you can have the ash tested to see exactly what they were leaching out of the soil. He seemed knowledgeable. He is planning on heating his home with Radiant/compost."

http://www.motherearthnews.com/Organic-Gardening/2008-10-01/Aminopyralid-Garden-Threat.aspx