Possible Clues:

• Cut large plant and nip in the bud small plant
• Judge in work is in clover
• Making architectural ornament is hard work, judge admitted
• A leaf having three leaflets
• Plant with three leaves, like shamrock
• Type of leaf that's strangely loftier
• Strive to keep arbiter in clover
• Girl Scout symbol
• Work keeping judge in clover, possibly
• Plant making modifications to rifle