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Hudson Valley Seed Co.

Rubenza Cosmos

Cosmos bipinnatus

Conventionally Grown

A color-changing cosmos with deep ruby blooms that fade to antique rose.

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 sophisticated shades of antique rose 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, unlike its taller, floppier cousins. It blooms early and keeps producing right up until frost, especially if you harvest stems frequently for bouquets. It is a buzzing hub for beneficial insects all summer long, and if you let the last blooms turn to seed, the plants become a natural feeder for hungry birds.

Unit Price Quantity Availability
75 Seeds $5.29
In Stock
225 Seeds $10.29
In Stock

Price as selected: $0.00

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 Full Sun (8+ Hours Sun)
Planting Depth ¼"
Row Spacing 12"
Plant Spacing 12"

    Rubenza Cosmos
    Rubenza Cosmos
    Rubenza Cosmos
    Rubenza Cosmos
    Rubenza Cosmos

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