Identifying Mystery Shells in Florida Pebble Yard

Inherited Florida house: Father's lawn "destroyed by crustaceans" leaving microscopic shells. Contractor installed grid/tarp/pebbles. Weeds now. Wants crustacean ID for biological control.

Reality Check

No crustacean species destroys lawns leaving microscopic shells. Likely scenarios:

• Crushed shell base material (common FL fill)
• Mollusk shells from ancient deposits
• Contractor's story to cover poor installation

Weed Solution: Vinegar

• Hot, sunny day
• Horticultural vinegar (20-30%) or household (5%, weaker)
• Spray weeds + surrounding pebbles
• Kills foliage, repeats for roots
• No residue, safe for pebbles

Soil Building (If Converting to Grass Later)

• Sugar/molasses: 1 lb/250-300 sq ft spring/fall
• Feeds microbes → rich soil → weeds don't germinate
• Expert's system: 3 years = weed-free

Shell Benefit

Shells = calcium carbonate. Slow-release pH buffer. Not harmful.

Forget crustaceans. Vinegar weeds. Build soil if planting grass. Shells are free lime.