Jaques d'Alltrades wrote:

Gelatine is a bit harsh. I could do the job for you using blasting
powder (black powder with a higher charcoal content than gunpowder)
without even covering-up your greenhouse with more than a sheet of ply
in front of it. (I used to 'lift' tree stumps using it, back in the
'fifties and 'sixties; and my party trick was to stand on the stump and
fire the charge while still standing on it.)

More farming than gardening, but high explosive has been used to
plant fruit trees. A bang, a hole with fissured sides excellent
for root penetration, and any fumes just provide fertiliser...
fast, too.