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Hudson Valley Seed Co.

Rubenza Cosmos

Cosmos bipinnatus

Conventionally Grown

A productive, upright cosmos whose cranberry-red flowers mellow to antique rose and amber, lending richly varied color to borders and bouquets.

Bring a dynamic, shifting color palette to your flower borders with this uniquely beautiful cosmos. Unlike the static colors of standard varieties, 'Rubenza' puts on a living show: solitary blooms open as a deep, velvety wine-red and gradually soften into shades of antique rose, terracotta, and amber as they mature. Set against delicate, ferny foliage and highlighted by bright golden centers, these flowers create a rich, multi-hued tapestry that looks wonderful in the garden and even better in a vase.

Practical gardeners will love this variety's robust habit. Growing to a manageable height of about three feet, it remains upright without the need for staking, even in exposed or windy borders. It blooms early and keeps producing right up until frost, especially if you harvest stems frequently for bouquets. It is a buzzing hub for bees and butterflies all summer long, and if you let the last blooms turn to seed, the plants become a natural feeder for finches.

Unit Price Quantity Availability
75 Seeds | Art Pack $5.79
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75 Seeds $6.39
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225 Seeds $11.99
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Growing instructions
Direct sow 1-2 weeks after the last frost when soil temperatures reach at least 60°F (16°C), covering seeds lightly. For an earlier start, sow indoors 5-7 weeks before the last frost and harden off before transplanting. Pinching plants promotes a bushier habit.
Product Details
Days to Maturity 75-90 days
Days to Germination 7-10 days
Width at Maturity 12"
Height at Maturity 36-48"
Hardiness Zone Range Annual
Sun Conditions Partial Sun (4-6 hours Sun), Full Sun (8+ Hours Sun)
Planting Depth ¼"
Row Spacing 12"
Plant Spacing 12"
About the artist
Vermont-based painter Margaret Shipman creates vibrant, intricate oil paintings inspired by the folklore, cultural history, and natural beauty of wild plants and medicinal herbs. Drawing from her background in cultural anthropology, her artwork often weaves historical text and botanical details to explore ancestral knowledge and the relationship between humans and the natural world. Original medium: Oil on canvas with resin paper collage
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Bright Rubenza Cosmos flowers from Hudson Valley Seed Co. with vibrant pink petals and lush green foliage.
Bright Rubenza Cosmos flowers from Hudson Valley Seed Co. showcasing vibrant red petals and lush green foliage.
Bright Rubenza Cosmos flowers with deep burgundy petals and green foliage, showcasing vibrant blooms from Hudson Valley Seed Co.
Bright Rubenza Cosmos flowers, vibrant purple and pink blooms, from Hudson Valley Seed Co., showcasing lush, colorful flower blossoms.
Bright Rubenza Cosmos flowers by Hudson Valley Seed Co. with vibrant, deep purple petals and delicate green foliage.