Tomato 'Colorado Grueso'

Try to plant in a location that enjoys full sun and remember to water moderately. Keep in mind when planting that Colorado Grueso is thought of as tender, so remember to ensure that temperatures are mild before moving outdoors. Planting Colorado Grueso in loamy soil with a ph of between 5.5 and 7.5 is ideal for as it does best in weakly acidic soil to weakly alkaline soil.

Start seeds indoors six weeks before last frost date.

Aim to sow 0.39 inches (1.0 cm) deep and try to ensure a gap of at least 0.78 inches (2.0 cm). Soil temperature should be kept higher than 12°C / 54°F to ensure good germination.

Plant to the first set of true leaves to promote strong root growth.

As Colorado Grueso is tender, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.

Collected originally from Argentina by the USDA in 1937, then obtained by a collector in Alberta, and ultimately donated to PGRC in 1967.¹

fn.1 Populuxe Seed Bank