How to Grow Rhubarb from Seed

Growing rhubarb from a seed takes considerably more time than growing it from a crown or cutting, but it can be a cheaper and easier way to start a large crop. In cool climates you can grow rhubarb as a perennial, which can be harvested year after year, or you can grow it as an annual, which is recommended in warmer areas.

Method 1
Method 1 of 4:

Starting the Seeds

  1. Rhubarb seeds are covered in a paper-like shell. Soaking the seeds for 1-2 hours before planting will prepare them for germination so that they begin rooting sooner.
  2. Mix equal parts peat moss, vermiculite, and compost to make your own basic potting mix.
    • Rhubarb does best in moderately acidic soil (pH 6.0 to 6.8). You can use a pH test kit or other methods to test the soil acidity.
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  3. Use a small, 2-3 inch (5-8 cm) pot or starter tray with drainage holes on the bottom. Fill the pots or trays with your soil mixture. Using your finger, dig a small hole about ½ inch (1.2 cm) deep. Place 2 seeds in the hole, then cover them with dirt and water them.
    • Use peat pots or cow pots to make transplanting easier.
    • Keep the soil evenly moist, watering when necessary. Do not overwater, as this can drown the seeds.
  4. If the room temperature is below 70 °F (21.1 °C) (21 C), you can use a heating table or heating mat to speed the process.
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Method 2
Method 2 of 4:

Growing Rhubarb as a Perennial

  1. [1] If you live in a state closer to the central or northern areas of the United States, such as Maine, North Dakota, or Indiana, it’s best to grow your rhubarb perennially. [2]
  2. Your growing seedlings need to be protected from the cold temperatures, so make sure that you put a protective cover overtop of them in this early stage while they’re fragile. Do this at least two months before your area’s estimated final frost of the year. [3]
  3. Harden off your plants by taking them outside little by little to get used to the sun, rain, and cold before exposing them to the elements permanently. [4]
  4. The plants should be about 4 inches tall at this point, so they’re ready to be transplanted. Remove the plants from their pot. Carefully tip the pots upside down to remove the plant and root ball. Dig a hole twice as wide and at least as deep as the pot your rhubarb is in. [5]
    • If the plant doesn’t come out with a little squeeze to the sides of the pot, you can use a butter knife to cut around the soil. It also helps to water the plants about an hour before your remove them from their pots.
    • If you used a peat pot or a cow pot you can simply place the pot with the plant into the soil.
  5. Prepare a suitable part of the garden. Choose somewhere cool that the rhubarb can happily grow at its own pace. Clear out enough space in the ground so that you can plant the roots 36-48 inches (90-120 cm) apart. Planting any closer together will crowd the plants.
    • In warmer climates it is important to find shade for your plants during hotter months. You can plant the rhubarb by tall shade plants (tomatoes, pole lima beans), or create shade with a shade cloth. [6]
  6. In order to allow your plants to thrive, you’ll need to keep them consistently and evenly moist. They’ll die if the sun dries their roots out. Mulching will keep the rhubarb roots properly cool and moist. [7]
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Method 3
Method 3 of 4:

Growing Rhubarb as an Annual

  1. Rhubarb can grow perennially in most areas of the U.S., but places like southern California, Texas, and Florida may only be able to grow rhubarb annually. [8]
  2. Rhubarb doesn’t do well in intense heat, so once you’ve soaked the seeds and planted them in a soil-filled pot, you’ll need to find a shady area for them. Either put the pot in a shaded spot outdoors or keep the pot indoors. This way, the seeds will stay healthy during hotter months as they’re growing into plants.
  3. Transplant the plants to the garden after about 30 days in the pot. At this point, they should be about 4 inches tall. Carefully tip the pots upside down until the plant and root ball slide out. Dig a hole that’s twice as wide as the plant. Plant the root balls as deep as they were in their pots.
    • To get the plants out of the pot, it helps if you water them an hour or so beforehand. If the root ball doesn’t come out with a little squeeze to the sides of the pot, you can use a butter knife to cut around the soil.
    • If you used a peat pot or a cow pot you can simply place the pot with the plant into the soil. [9]
    • To avoid overcrowding the plants, clear out enough space in the ground so that you can plant the seeds 36-48 inches (90-120 cm) apart.
    • Consider planting the rhubarb on a raised bed or in a hillside to avoid drainage issues. [10]
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Method 4
Method 4 of 4:

Harvesting the Rhubarb

  1. It is essential to keep the soil evenly moist, so keep a close eye on your plants in the summer for signs of withering, yellowing, or dry soil. For best results, water your plants in the morning. [11]
    • Be careful not to overwater the plants, as they are susceptible to root rot. To avoid this, you can plant rhubarb on a hillside or on raised beds.
  2. Because a rhubarb crop can take several years to become established, you might want to grow a couple of plants from a crown while your seeds grow, mature, and become harvestable. [12]
  3. Wait at least two years until you start harvesting your rhubarb so that the plant can become established. Pull off the stalks at soil-level. To keep the plant healthy, only take a few stalks at a time.
    • Only eat the stalks -- rhubarb leaves are toxic! [13]
  4. Areas that grow rhubarb annually tend to have severely hot summer temperatures. Make sure to harvest your rhubarb in the late spring before the heat has a chance to kill the crop. [14]
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Community Q&A

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  • Question
    Planting seeds in a hot climate. If it takes 2 yrs to grow rhubarb, how is it possible to grow an annual crop? Is there a strategy?
    Donagan
    Top Answerer
    Plant some every year, and beginning in the second year you'll harvest some rhubarb.
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      Video

      Tips

      • Remove rhubarb flowers in the spring. These will sap the plant’s energy and make for a less delicious stalk. [15]
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      • Rhubarb stems grown from a seed may not have the intense red hue that you’re used to, but the flavor should be just the same. If you want all red stalks, you might want to get a crown or division from an existing plant. [16]
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      Warnings

      • Do not eat the stems if they appear soft and mushy. It is possible for oxalic acid to migrate from the leaves to the stems during extreme cold.
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      Things You'll Need

      • Rhubarb seeds
      • Potting soil and containers
      • Area of the garden set aside
      • Shade cloth, if sunny

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      References

      1. ↑ http://www.southernexposure.com/blog/2015/02/growing-rhubarb-from-seed/
      2. ↑ http://planthardiness.ars.usda.gov/PHZMWeb/
      3. ↑ http://www.southernexposure.com/blog/2015/02/growing-rhubarb-from-seed/
      4. ↑ http://www.southernexposure.com/blog/2015/02/growing-rhubarb-from-seed/
      5. ↑ http://www.almanac.com/plant/rhubarb
      6. ↑ http://www.southernexposure.com/blog/2015/02/growing-rhubarb-from-seed/
      7. ↑ http://www.southernexposure.com/blog/2015/02/growing-rhubarb-from-seed/
      8. ↑ https://gardenambition.com/growing-rhubarb-from-seed/
      9. ↑ https://gardenambition.com/growing-rhubarb-from-seed/
      1. ↑ https://gardenambition.com/growing-rhubarb-from-seed/
      2. ↑ http://www.gardeners.com/how-to/when-to-water/8108.html
      3. ↑ http://www.thompson-morgan.com/how-to-grow-rhubarb
      4. ↑ https://medlineplus.gov/ency/article/002876.htm
      5. ↑ http://www.southernexposure.com/blog/2015/02/growing-rhubarb-from-seed/
      6. ↑ http://www.thompson-morgan.com/how-to-grow-rhubarb
      7. ↑ http://www.southernexposure.com/blog/2015/02/growing-rhubarb-from-seed/

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