Kniphofia uvaria, Red Rocket
Intense red flowers from early June to September.
Zone This refers to the USDA hardiness zone assigned to each part of the country, based on the minimum winter temperature that a region typically experiences. Hardiness zone ranges are provided for all perennial plants and you should always choose plants that fall within your range.
Sun The amount of sunlight this product needs daily in order to perform well in the garden. Full sun means 6 hours of direct sun per day; partial sun means 2-4 hours of direct sun per day; shade means little or no direct sun.
Height The typical height of this product at maturity.
Spread The width of the plant at maturity.
Bloom Season The time of the year when this product normally blooms.
Resistant To Adverse garden conditions, such as heat or frost, deer or rabbits, that this product can tolerate well.
Deer, Disease, Heat, Humidity, Rabbit
Plant Shipping Information
Plants begin shipping week of:
Mar 26, 2018Click here for Spring shipping schedule
Item 21155 cannot ship to: AA, AE, AK, AP, AS, CN, FM, GU, HI, MH, MP, PR, PW, VI
See all Burpee plant shipping restrictions for your state
Start Indoors Starting seeds indoors is called Indoor Sow or Indirect Sow and these dates are when to sow seeds indoors in the spring or summerTransplant When to transplant bulbs or roots in the garden for springStart Outdoors Starting seeds outdoors is called Outdoor Sow or Direct Sow and these dates are when to sow seeds outdoors in the spring or summerStart Indoors Fall Starting seeds indoors in the fall called Indoor Sow or Indirect Sow and these dates are when to sow seeds outdoors in the fallTransplant Fall Transplant Fall-When to transplant bulbs or roots in the garden for fallStart Outdoors Fall Starting seeds outdoors in the fall is called Outdoor Sow or Direct Sow and these dates are when to sow seeds outdoors in the fallJanFebMarAprMayJunJulAugSepOctNovDec
Kniphofia: Indoor or Direct Sow or Potted Perennial Plant
How to Sow and Plant
Kniphofia, otherwise known as Tritoma, may be grown from seed sown early indoors and transplanted outside after frost, or sown directly in the garden in summer, or planted as a potted plant.
Sowing Seed Indoors:
- Sow kniphofia seeds indoors 6 weeks before the last frost in spring.
- Sow thinly and evenly and lightly cover with seed starting formula.
- Keep the soil moist at 70-75 degrees F
- Seedlings emerge in 20-30 days
- As soon as seedlings emerge, provide plenty of light on a sunny windowsill or grow seedlings 3-4 inches beneath fluorescent plant lights turned on 16 hours per day, off for 8 hours at night. Raise the lights as the plants grow taller. Incandescent bulbs will not work for this process because they will get too hot. Most plants require a dark period to grow, do not leave lights on for 24 hours.
- Seedlings do not need much fertilizer, feed when they are 3-4 weeks old using a starter solution (half strength of a complete indoor houseplant food) according to manufacturer’s directions.
- If you are growing in small cells, you may need to transplant the seedlings to 3 or 4 inch pots when seedlings have at least 2 pairs of true leaves before transplanting to the garden so they have enough room to develop strong roots
- Before planting in the garden, seedling plants need to be “hardened off”. Accustom young plants to outdoor conditions by moving them to a sheltered place outside for a week. Be sure to protect them from wind and hot sun at first. If frost threatens at night, cover or bring containers indoors, then take them out again in the morning. This hardening off process toughens the plant’s cell structure and reduces transplant shock and scalding.
Planting in the Garden:
- Choose a site with well-drained soil in full sun or part shade where the summers are hot.
- Prepare the bed by turning the soil under to a depth of 6-12 inches removing any debris, and lightly raking as level as possible.
- The addition of organic matter (leaf mold, compost, well-rotted manure) benefits all gardens and is essential in recently constructed neighborhoods.
- Plant on a cloudy day or in late afternoon to reduce transplant shock.
- Dig a hole for each plant, approximately 24 inches apart large enough to amply accommodate the root ball.
- Unpot the plant and gently loosen the root ball with your hands to encourage good root growth.
- Place the top of the root ball even with the level of the surrounding soil. Fill with soil to the top of the root ball. Press soil down firmly with your hand.
- Use the plant tag as a location marker.
- Thoroughly water and apply a light mulch layer on top of the soil (1-2 inches) to conserve water and reduce weeds.
Sowing Directly in the Garden:
- Sow seeds directly in a protected area of the garden in mid-summer. The soil should be about 70-75 degrees F.
- Remove weeds and work organic matter into the top 6-8 inches of soil; then level and smooth.
- Sow thinly and cover with ¼ inch of fine soil. Firm lightly and keep evenly moist.
- Seedlings will emerge in 20-30 days depending on soil and weather conditions.
- Move young plants to their permanent locations in fall or early spring. Plants prefer a site with well-drained soil in full sun or part shade where the summers are hot.
- Keep weeds under control during the growing season. Weeds compete with plants for water, space and nutrients, so control them by either cultivating often or use a mulch to prevent their germination.
- Mulches also help retain soil moisture and maintain even soil temperatures. For perennials, an organic mulch of aged bark or shredded leaves lends a natural look to the bed and will improve the soil as it breaks down in time. Always keep mulches off a plant’s stems to prevent possible rot.
- Careful watering is essential in getting perennials off to a good start. Water thoroughly at least once a week to help new roots grow down deeply. Soil should be damp at about 1 inch below the soil surface. You can check this by sticking your finger in the soil. Water early in the morning to give all leaves enough time to dry. One inch of rain or watering per week is recommended for most perennial plants. You can check to see if you need to add water by using a rain gauge. Kniphofia is fairly drought tolerant and long lived when they are well sited.
- Until plants become established, some protection from extreme winds and direct, hot sunlight may be necessary. Good air movement is also important.
- After new growth appears, a light fertilizer may be applied. Keep granular fertilizers away from the plant crown and foliage to avoid burn injury. Use low rates of a slow release fertilizer, as higher rates may encourage root rots.
- Cut spent flower stalks to the base after blooming. After the plants bloom, cut the foliage back by half for a neater appearance.
- In areas with cold winters divide the plants in spring. In warmer regions, divide the plants after they bloom. Divide every 4-5 years.
- In cold areas protect over the winter after the ground freezes with a layer of straw of Christmas tree branches.
- When growing from seed, germination may benefit from a cold period of four weeks in the refrigerator.
- Kniphofia makes a fascinating border plant. The flowers are great for cutting as well. The bright tubular flowers are very attractive to hummingbirds.