Almost every seedbomb recipe calls for powdered red clay which, unless you befriend a potter, is difficult and costly to get hold of. I'm offering an alternative using....cat litter.
Step 1: Ingredients:
bentonite-based cat litter - this is important! Only bentonite-based litter can be used as a red clay substitute.
gloves (bentonite is very drying on your hands)
Step 2: Method
1 part seeds
3 parts compost
3 parts cat litter
2 parts water.
Mixture should resemble brownie dough and have a firm consistency.
Step 3: Form the Seedbombs
Form into small balls, somewhere between the size of a marble and a golf ball.
(Commercially available seedbombs are much larger, and in fancy shapes but take forever to break down and aren't so good at throwing through gaps in fencing etc)
Dry for 24 hours.
Step 4: You're Ready!
You might want to include instructions and/or information (e.g. "For best results throw in the springtime" or "contains love-in-a-mist, sunflower, poppy seeds - do not eat" etc).
A handmade gift for the guerrilla gardener in your life!