A, do half without the egg shells to compare the results.

after the frosts have stopped, takes about 3 months to flower,
B. drill 3/4 x 1/2 inch [12mm] holes in the bottom of a plastic bucket, fill it with a growing mix, plant 4 gladioli in a diamond/square pattern, cover with 2-3 inches of soil, water as required, place in the unused part of the back yard.
C, drill another bucket, growing mix, 1-2 "Pom-Pom Dalia" bulbs, put it in the outback as well.

have fun