Abstract: Plant supplement delivery assemblies are provided that can include an insert having collapsible insert sidewalls complimentary to the exterior sidewalls of the assembly housing, the collapsible insert sidewalls defining at least a portion of a container configured to house a plant supplement. Plant supplement delivery inserts are also provided that can include collapsible sidewalls extending between a discharge end and a butt end to define a container configured to house plant supplement. The butt end can be configured to operably engage a biased member, and the insert can further include a stem extending from the discharge end. The stem can define a conduit in fluid communication with the container. Methods for providing plant supplements are also provided. The methods can include operably engaging a biased member with a butt end of a container to collapse sidewalls of the container and provide plant supplement from the container through a stem into a plant.