Possible Clues:

• Plant a bulb with no end of soil
• A niece regularly eating fish — and mushroom for example
• Smelly plant leaves large on a fungus
• Mushroom cloud's heading after Gagarin, whose shield's shot
• A fish I caught -- or mushroom?
• Stove's on ... cereal shortly, and mushroom
• Type of mushroom
• Under stove, no end of abundant mushroom
• Cultural organisation complicated by old police force with toadstool
• Fungal growth briefly abounding beneath cooker