To cite plotgardener in publications use:

  Nicole E Kramer, Eric S Davis, Craig D Wenger, Erika M Deoudes, Sarah
  M Parker, Michael I Love, Douglas H Phanstiel, Plotgardener:
  cultivating precise multi-panel figures in R, Bioinformatics, 2022

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Plotgardener: cultivating precise multi-panel figures in R},
    author = {Nicole E. Kramer and Eric S. Davis and Craig D. Wenger and Erika M. Deoudes and Sarah M. Parker and Michael I. Love and Douglas H. Phanstiel},
    journal = {Bioinformatics},
    year = {2022},
    url = {https://doi.org/10.1093/bioinformatics/btac057},
    doi = {10.1093/bioinformatics/btac057},
  }