To get bombs in Gardenscapes, you need to create them by matching pieces strategically. Start by matching 4 pieces to create a firecracker. This firecracker explodes in a cross-section.
Next, match 5 pieces to create a bomb. This bomb has a 2-tile radius and can clear more space. If you match 6 pieces, you will create dynamite. Dynamite has a 3-tile radius and is more powerful.
Lastly, match 7 pieces to create TNT. TNT has a 4-tile radius and clears the most space. You can detonate these explosives by moving them to an adjacent block or double-tapping them in place.
Use these explosives near hazards or hard-to-remove pieces for best results. They are one-time use, so plan wisely!