Depends on how many rocks, the size of the rock, which recipe you use, the cost of the product in your area, how many failed rocks you make and your labor. There's just no way to tell because of those variables. Billie

riiight. I knew someone would say that. I just wondered if anyone felt is was cheaper than say just buying rocks and putting them down I guess.

It is probably cheaper to buy rock........BUT how much does rock cost in your area??? lol!
Look at it this way after buying all the ingredients, your labor to mix and mold, then waiting for them to cure, then your labor unmolding and cleaning and hoping they turn out and you like them, then placing them around your house.Is it worth all the time and hot sweaty labor? And how many rocks are you talking??
Go to quarry (that's where we go around here), pick out rock and have them delivered (or haul home yourself, oh god, I remember those days...last weekend) then place around your home. It's easier and you can match your house and you know their going to turn out.
Many of us make things because we enjoy the creativity and fun. Myself, I can't imagine making tons of rocks being fun.
Keep us posted if you do rock on. We'll cheer you on!

I will be trying this out for sure. but after i finish planting and painting the gourds im selling and and and !! haha

oh, good lord, buy the rock :>) Billie is right. It would be one of the 12 labors of Hercules to make a border out of hypertufa. I am from New England where rocks are a winter crop, and I would still buy them for a job like that.

I got a ton of river rock you can have for FREE!!

LOL, I am trying to picture a "failed rock"...I imagine a failed anything else would become a rock or collection of rocks that I plan to use to line my beds.