The effects of growing media, pot size, number of stems, and plant density on fruit yields of greenhouse‐grown babaco plants(Carica × heilborniiBadillo n.m.pentagona(Heilborn)) were determined. No significant differences were found in the total yield or days to harvest between plants grown in sawdust and Peatlite (2 peat : 1 perlite), nor between plants grown in 23‐litre and 45‐litre pots, nor between two‐stemmed and single‐stemmed plants. However, two‐stemmed plants produced significantly more, but smaller, fruits/plant than single‐stemmed plants. The yield (fruit weight)/plant = 6.88 + 4.50/xr2=0.97,P <0.05, fruit number/plant = 1/(0.050–0.0075/x)r2 = 0.79,P <0.05, and fruit size (mean fruit weight) = 386 + 313‐x/0.86r2 =0.94,P <0.05, decreased over plant densities ranging from 0.5 plants/m2to 3.7 plants/m2. However, on an area basis, yield (fruit weight)/m2= 1/(0.032 + 0.155‐x)r2= 0.79,P <0.05, and fruit number/m2= ‐23.3 + 49x‐2r2 = 0.98,P <0.05, increased, indicating that with increasing plant density, greater economic returns might be achieved, disregarding fruit size, which decreased with higher yields. The flowering habit of the babaco is indeterminant and as fruit are formed further up the stem, they mature smaller. At 49°N where the experiments were conducted, plants failed to set fruit from November to March. This pattern was related to the amount of solar radiation and daylength.