Possible Clues:

• Leaves for the holidays?
• Note is a tip about what can provide floral decoration
• Petitions a movement for plant
• Christmas gift? Friend of Hal's worried about it when getting up
• Plant pot with anise, it turns out
• Opiate isn't in the wrong flower
• Petitions a movement for a Christmas plant
• Plant isn't opiate, sadly
• Plant in a pot, site needing digging over
• A petition's sent out to plant