Biodiversity loss and climate change are interlinked and mutually reinforcing. However, many people perceive both crises as abstract and psychologically distant threats. Citizens may struggle with translating these global crises into imminent concerns they can act on in their local livelihood. The present study engages private homeowners to reflect on the interrelation between biodiversity loss and climate change and the role they personally play in a familiar environment - their own garden. Private gardens may bridge species habitats and can help people to build a connection to the natural world; at the same time, the single-family home lifestyle generally implies a large carbon footprint. More than 300 Austrian households have signed up to implement biodiversity-promoting elements and techniques in their garden. As citizen scientists, they monitor changes in selected indicator species and report them via a nature observation app. As intervention participants, they complete the first wave of a longitudinal survey to determine whether the experiences, competences and knowledge acquired by engaging with the own garden are transferred to biodiversity- and climate-friendly consumption. Preliminary results show a self-selective sample of households who already plant native species and apply natural fertilisers and weed control. Many participate in other nature conservation or citizen science formats and have extensive biodiversity knowledge. Biodiversity-friendly consumption is weakly associated with a vegetarian, local, seasonal and organic diet and frugal clothing consumption, but mostly unrelated to other climate-relevant everyday behaviours. Self- and collective efficacy beliefs for protecting biodiversity and the climate are highly intercorrelated, however the correlation with collective efficacy for climate protection is weaker. At the conference, further results after the first growing season are presented. We provide recommendations how to better align activities for biodiversity preservation and climate action.