Technical Abstract: Cuphea (Cuphea viscosissima Jacq. x C. lanceolata W.T. Aiton) is a potential new oilseed crop for temperate regions. Harvesting problems occur because current varieties are non-determinate and shatter seeds. We investigated the effects of swathing and combining of windrows at weekly intervals on windrow weight, seed water content, and seed yield. Windrow weights decreased from about 40 to 14 Mg ha-1 as combining was delayed after swathing from 0 to 3 weeks. Weight loss was associated hyperbolically with post-swathing evaporation (Eps). Similarly, seed water content decreased from about 0.67 g g-1 at swathing to about 0.25 g g-1 at 40 mm Eps. Seed shattering apparently was low, and high yields were maintained each year until after 40 mm Eps. Seed oil content was affected only slightly by delayed combining dates. Thus, swathing cuphea and delaying combining until 40 mm Eps substantially decreased the weight of swathed material processed by the combine, reduced seed water content, but maintained high seed yields and seed oil contents.