Cosmos Seeds, Rubinato

star-filled
4.6
21 Reviews
Sku:
#FL152
Min. seed count:
30
$3.75

Description

(Cosmos bipinnatus). Super dwarf red cosmos! Here’s an outstanding addition to the Cosmos clan—award-winning color on compact plants! The color is the very best of the burgundy magenta that makes this cosmos so endearing in the summer garden. The tones vary from medium to super deep. The single blooms have very wide petals; the overall effect is reminiscent of richly pleated silk. The 24-inch plants are compact, never lanky. Recently recognized with Europe’s Fleuroselect award. Spectacular!

  • Annual
  • 60-90 days to maturity
  • 6-8 hours of full sun
  • Sprouts in 7-21 days
  • Seed Depth: 1/4"
  • Plant Spacing: 12-15"
  • Ideal Temperature: 70-75 F
  • Frost Hardy: No

Growing Tips, Tricks and FAQs

Growing Tips

Rubinato cosmos is an heirloom variety that thrives in full sun and prefers poor to moderate soil. Unlike taller cosmos varieties, this compact plant is well-suited for borders, containers, and cutting gardens. This drought-tolerant annual will continue blooming all throughout the season with regular deadheading. Avoid excessive fertilization, as too much nitrogen causes the growth of leaves rather than flowers.

When to Grow

Sow cosmos only after the danger of frost has passed and soil temperatures have warmed to at least 60 F. As cosmos are sensitive to frost, be sure to check your local area’s last frost date before planting. If you’re not sure how to do that, give our blog post ‘Our Experts Answer Questions, Share Resources’ a read. This variety reaches maturity and begins flowering 60-90 days after sowing, with blooms continuing through summer, until the first frost arrives.

How to Sow and Plant

Direct sow seeds outdoors once temperatures are warm, or start indoors 3-4 weeks before the last frost. The seeds need some light to germinate, so sow them about 1/4 inch deep, covering with soil very lightly. Space plants about 12-15 inches apart for good air circulation. Germination typically takes 7-21 days. Choose a location with full sun exposure at least 6-8 hours daily for the best results.

How to Grow

Rubinato cosmos thrives in light, well-draining soil and does not require nutrient-rich conditions. In fact, it performs best in average to poor soils, as overly fertile ones can lead to excessive foliage at the expense of blooms. Water sparingly, allowing the soil to dry out between waterings to prevent leggy growth. To prolong the blooming period, remove spent flowers regularly.

How to Save

  • Cosmos are insect pollinated, and there may be some crossing between varieties in the garden. You can enjoy the mixing or use caging techniques and hand pollination to avoid crossing.
  • Saving seeds from cosmos is easy: simply allow the heads to brown and dry on plants and collect seeds. Store in a cool, dry, dark place over winter.

FAQ

What companion plants pair well with Rubinato cosmos?
Cosmos grow well alongside zinnias, marigolds, sunflowers, and herbs like basil or dill, creating a colorful, pollinator-friendly garden.

Does Rubinato cosmos need support or staking?
Because of its compact nature, it generally does not require staking. However, if grown in very windy areas, light support may help prevent bending.

Will Rubinato cosmos return every year?
Cosmos are annuals, meaning they complete their life cycle in one season. However, they can self-seed, so new plants may appear the following year.

delivery
FREE SHIPPING IN THE U. S. A. Alternate domestic shipping options available at checkout
Cosmos Seeds, Rubinato
star-filled
4.6
Customer reviews (21)

Similar Products

4.4
star-filled
2.9
star-filled
$3.75
Close Popup