One "seed efficient" method to unlock and catch all 10 Jadinkos would be to follow these steps:
Common jadinko - Plant a green flower
Carrion jadinko - Plant a kalferberry bush and build a boneyard
Diseased jadinko - Plant a banana tree
Cannibal jadinko - Build tall grass and use a dose of juju hunter potion on the flower patch
Shadow jadinko - Plant red flower and build abandoned house
Aquatic jadinko - Build a pond, plant an apple tree, and use another dose of juju hunter potion on the flower patch if the effect of the previous potion has worn off
Camouflaged jadinko - Plant a lergberry bush, build standing stones, and use another dose of juju hunter potion on the flower patch if the effect of the previous potion has worn off
Draconic jadinko - Build a dark pit and use another dose of juju hunter potion on flower patch if the effect of the previous potion has worn off
Amphibious jadinko - Plant a blue flower and build a pond
Igneous jadinko - Build a vent and plant an orange tree