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Hothouse is a podcast about design, ecology, and the way we garden now. Host Leah Churner sits down with experts and enthusiasts to talk about permaculture, the urban landscape, and how plants sometimes give us the feels. A meeting of the minds for plant people and the horticulture-curious, Hothouse is a different kind of gardening show: less of the how-to and more of the who, what, where, when, and why.

May 7, 2023

On this episode, we’re tackling Phosphorus – an element, crucial to life on earth, which exists in both abundance and scarcity. We cover how humans got hooked on P fertilizers, the political and environmental impacts of mining and pollution, and what might be done about it. 

Mentioned in this episode: 

City of...


Mar 25, 2023

On this episode, we’re gettin’ down and dirty with sheet mulch. Sheet mulching is a no-till, no-dig gardening practice of removing unwanted vegetation and building fertile soil by layering organic matter and letting it compost in place. While the layers suppress weeds by blocking sunlight, subterranean soil biology...


Mar 14, 2023

"Fruit trees need hands-on care." That's the motto of our guest, Susan Poizner of OrchardPeople.com. Susan is an urban orchardist, teacher, journalist, and filmmaker. She is the author of Growing Urban Orchards (2014), cofounder of the Ben Nobelman Park Community Orchard in Toronto and the host of the Urban Forestry...


Dec 23, 2022

In this roundtable, we talk about drafting and drawing with Lisa Nunamaker, of Paper Garden Workshop, and Amy Fedele, of Pretty Purple Door, two fabulous garden educators who offer online courses in landscape graphics. Leah took courses from both instructors this year -- Lisa's Garden Graphics Toolkit and Amy's Great at...


Nov 3, 2022

A rose by any other name would smell as sweet, but some of the common names we use for plants downright stink! In this episode, we're diving into problematic colloquial names. Some common names are geographically misleading (“Jerusalem artichoke”); others are xenophobic, racist, or antisemitic ("wandering Jew");...