The four beds
Ivo’s seeds do not go in ordinary planters. The thread “Where to plant Ivo seed?” names four beds. Central Comms, in front of the door that closes at 0:15. Cathedral Courtyard, behind the locked railing. Somewhere in the Ocean. And the room one floor under the cathedral elevator, the one you open with the lock. Order between the four is not fully published. Plant where you can reach, and keep the seeds.
The 1.0.0.64 silence
Patch 1.0.0.64 introduced a bug: second-form Ivo stops talking at a point in his line. The developer acknowledged it and gave a bypass. If you have planted two seeds, wait for bell 4 and speak to him then. The same patch changed the achievement so it pops as soon as you complete the act, instead of waiting on a later flag. On 1.0.0.65, try the bell-4 talk before you assume a seed was lost.
Show a stronger hint
A silent Ivo after two seeds is the known bug, not a missing bed. Bell 4.
Show the sourced solution
Beds: Central Comms door (closes at 0:15), Cathedral Courtyard behind the railing, the Ocean, and the locked room one floor under the cathedral elevator. If he goes silent after two seeds on 1.0.0.64 or later, talk at bell 4. Developer bypass.
Questions this page answers
Where do you plant Ivo seeds in Echo Weaver?
In four special beds: the Central Comms door that closes at 0:15, behind the Cathedral Courtyard railing, in the Ocean, and in the locked room under the cathedral elevator.