Probably anyone propagating lilies by seed already knows this, but I'll say it again.
For plants like poppies that are likely to be fully ripe on Thursday then split open and drop on Friday,
organza bags are a great invention.
The fine mesh fabric lets rain evaporate and air circulate.
The drawstring-neck keeps every seed inside the bag.
You can re-use organza bags.
They come in all sizes and colors - even large enough to hold a bottle of wine!
They are easy to find in the "Wedding Supplies" Isle of a craft store or Wal-Mart.
They can be had cheaply on-line.
http://www.yourorganzabag.com/...
3x4" - - - 7 cents each, bag of 30
4"x6" - - - 14 cents each, bag of 30
6.5"x 15" - - 33 cents each - - Wine Bags, bag of 10
http://www.giftsintl.com/organ...
eBay
probably Etsy
http://www.uline.com/BL_5517/O... (more expensive and bigger bundle sizes)