I live in FL and my yard is over run with sand spurs that are constantly being tracked into the house on our shoes and our dog's fur. I'm looking for a way to get rid of them easily and most importantly inexpensively.
It's challenging to deal with sand spurs after they develop. You should use a pre-emergent in early spring (there is corn gluten meal if you are going an organic route), and keep your grass as healthy as possible, as this will help crowd out sand spurs. Do not use a fertilizer too high in nitrogen, as it can encourage sand spur growth.
Christy, Lakes Wales' Sandy Ridge acidic soils are the culprit and you'll constantly have to deal each year with the sandspurs unless you get the soil and turf into shape. You didn't say how much property you have so I'm going to assume you have a normal size lot and not acreage. Get a soil analysis from the Extension office. You probably have a pH of 4.5 - 5.5. You will want to amend your turf soils with dolomitic limestone to lower the acidity and raise the soil pH. Layer organic amendments on your turf like top soil and compost in 1" increments to aid in soil nutrition. Use a pre-emergent herbicide in March and a herbicide at the end of September. Always use a bagger on your lawn mower to pick up all the sand spur seeds. Do not add your leaf clippings to a compost pile or leave on lawn. I'm assuming you have bahiagrass, so make sure that you're irrigating (1x a week in winter, 2x a week in spring and summer if no rain.) fertilize 2x a year (April and end of Sept) with 15 -0 -15. Keep your lawn healthy and you'll get rid of the sandspurs. If possible, reduce your areas of turf and add more landscape beds. If you want to treat acreage, contact Mary Beth Henry, (863-519-8677) at the UF/IFAS Polk County Extension for your solutions.
I got rid of mine with a shovel and a pair of flip flops. I think they put there sandspurs out in July, you dig them up and take them to the dump. Then you get a cheap pair of then flip flops and walk around so they stick in the shoe and then you put them in the trash. if you let the spurs drop they will just keep coming back and spread more. now I have more sand spurs.
Growing up in the area I feel for you. Being a farmer my Dad would have us dig/pull them up with gloves and put in the fire pit then we would use burlap feed bags with sand in the bottom to pull over ther area to collet the spurs for any left behind will reproduce. Lime will also sweeten dirt and they prefer a sandy dry soil (citrus area)
I grew up in the Gainesville area and we were constantly battling those devils as well! I remember my dad having us drag burlap bags where we'd clean them out, but don't remember if he added any sand for weight. Good idea. He also said sandspurs don't grow in fertile ground so I'd add as much compost and manure as you could get your hands on. Maybe a nearby farmer with cows and/or chickens would let you haul as much as you want for free.