Possible Clues:

• Plant such as cowslip
• A half-ripe plum could be in flower
• Cowslip genus
• Spring flower
• That gets a blooming proper start
• Precise, if shapeless, formula produces something flowery
• Wet soil, mostly during April, ruined plant
• Girl has fuchsia finally replaced by border plant
• Cowslip relative
• Fixed up rail to protect minute flower