There are various ways to make seed bombs. We chose the method that used materials we already had on hand. It was one of the cleaner options as well.
Start by choosing seeds that grow well in your area. A quick glance at 'native' plants may be helpful.
Put scrunch tissue in a large bowl - this scrunchy filler can often be found in the gift wrap section of your local Dollar Tree (and possibly lingering in the bottom of any recently received gift bags) If you have a paper shredder, you could recycle the collected shreds or make your own shreds using colored paper.
(gotta make time for BigSib Photo breaks)
Toddler helper optional but highly encouraged.
Pour water into the scrunchy paper. You may wish to add layers of color separately to prevent dyes from blending.
Mush the paper together until it will hold shape, then drain excess water:
Mix in seeds:
Roll paper to form jawbreaker sized bombs (or larger if desired) Paper can also be pressed into cookie cutters to form other shapes.
This part is not unlike the process for home made paper. Once a shape is formed, squeeze any remaining water and place on a cookie sheet to dry. This may take a day or longer.
As you might be able to see, by the time we returned to this project, the 'bombs' had already begun sprouting.
All that remained was to toss them into abandoned lots or areas that needed a touch of life. To me, it was the trickiest step. For all the positives associated with planting flowers and sprucing up unsightly plots, tossing the bombs from my car window into scrubby areas, without the benefit of explaining, "We are not littering!" felt deviant.