big blue stem (Andropogon gerardii 'Blackhawks') plant — close-up photo
Easy to grow

big blue stem

Andropogon gerardii 'Blackhawks'

Overview

Big Blue Stem, or Andropogon gerardii 'Blackhawks', is a remarkable native grass with a captivating appearance. Its stunning black leaves give a bold contrast to the light tassel-like flower stems that appear in late summer. Its drought- and fire-resistant ability make it a great hardy choice for gardens with low maintenance needs. The majestic grass is attractive to both birds and butterflies that visit the garden. Its ornamental character and deep roots help fight soil erosion and absorb excess moisture. The big blue stem is truly a wonderful addition to any garden and an amazing sight to behold.

Care Guide

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Watering

Water Big Blue Stem (Andropogon gerardii 'Blackhawks') plants regularly and deeply to keep them healthy and promote growth. Water the soil about 2 -3 inches deep each time you water, aiming for an inch of water every week. It is best to water the plants in the mornings, when temperatures are coolest and the wind is calm and the sun won’t evaporate the moisture before it sinks into the soil. If possible, try to avoid wetting the foliage. When temperatures are high in summer, you may need to water twice a week. In winter, Big Blue Stem needs less water, so watering once every 2 weeks should be sufficient.

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Light

Big bluestem (Andropogan gerardii 'Blackhawks') is a native grass that prefers full sun, although it can tolerate some light shade for part of the day. During the summer months, it should receive at least 6-8 hours of direct sunlight each day. In the winter, the ideal amount of light will depend on your location and will likely be less than during the summer. In areas that get very cold winters, this species may require up to 8 hours of sun per day. However, in areas with milder winters, it may be fine with just 4 hours of direct sun.

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Soil

Sandy Loamy Clay Rocky

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Temperature

Hardiness zone 4–9.

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Pruning

Big Blue Stem (Andropogon gerardii 'Blackhawks') is best pruned in early spring, before growth begins and the new stems are visible. Pruning should be done to remove any dead and diseased stems as well as any stems that are not growing horizontally. Pruning should be done sparingly since Big Blue Stem grows slowly and deep-rooting, so it benefits from being left undisturbed at the base for a long time. Avoid pruning too much of the leafy part of the plant, as this will reduce the plant's overall health. If shaping is desired, a light cutting back of the top portion of the stems can be done in late summer, being sure to not take more than 1/3 of the overall stem length. Lastly, don’t forget to remove any seed heads to prevent self-seeding.

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Propagation

Division, Cutting, Seed Propagation, Root Suckering, Layering Propagation

Diseases & Pests

Common pests: Pest resistant, Disease resistant, Deer resistant, Drought resistant.

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