Garten: a Lenia garden. Lenia is a continuous cellular automaton: every cell of a square world that wraps around at its edges holds a little matter, between nothing and full, and each step every cell looks at a ring of neighbours, weighs them with a kernel and grows or shrinks depending on how close that weighted sum is to a preferred value. Some parameter sets produce creatures that glide, turn or pulse, most famously Orbium. Dragging sows noisy matter, erase mode removes it. A species browser loads known parameter sets, a kernel editor changes the ring and the growth curve live, and a search tries random starts until something stays alive. The toolbar also switches palette, view, speed and brush size, pauses, resets, picks a new seed, saves an image, copies a link and opens the help.