How to Grow Geranium X Johnson's Blue From Seed

Written by katelyn lynn
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The Johnson's Blue Geranium is a low-growing, compact herbaceous perennial plant. It is hardy in the USDA zones 4 to 8. Johnson's Blue Geranium can grow 15 to 18 inches tall and spread 2 to 3 feet wide. This variety of geranium is prized for its bright, periwinkle-blue, saucer-shaped flowers that appear in May and bloom through September. Plant Johnson's Blue Geranium where it will receive full sun, in pots, or as a border plant, and it will attract bees and butterflies to your garden.

Skill level:
Moderately Easy

Things you need

  • Johnson's Blue geranium seeds
  • Seed starting compost
  • Seed starting tray or planting cells
  • Clear cling film or sheet of glass
  • Watering tray

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    Planting Johnson's Blue Geranium Seeds

  1. 1

    Fill a seed-starting tray or planting cells with a quality seed-starting compost.

  2. 2

    Dampen the seed-starting compost in the growing containers. Pour water into a seed-starting tray until you are certain the soil has been thoroughly moistened. Set plainting cells into a watering tray and pour water into the tray one inch at a time. Drain the excess when the soil in the cells is visibly dampened.

  3. 3

    Pack the soil in the seed-starting tray or the planting cells with the back of a spoon or your fingers. Place the seed starting-tray into a compatible watering tray or similar container

  4. 4

    Scatter three or four Johnson's Blue Germanium seeds over the soil in each of the growing containers. Push the seeds into the soil using the back of a spoon or your fingertips. Sprinkle a thin layer of the seed-starting compost over the seeds. Try not to cover the seeds with more than about 1/4-inch of soil.

  5. 5

    Cover the planting cells with clear cling film or place them into polythene bags. (Make sure the plastic does not come in contact with the soil in the planting cells). If sowing the seeds in a seed-starting tray, use a sheet of glass or clear cling film to cover the tray.

  6. 6

    Place the tray of planting cells or the seed-starting tray in a warm location. Keep the temperature in the range of 21.1 to 23.8 degrees C. Provide plenty of light, about eight to 10 hours daily but out of direct sunlight. Check on the containers at least once a day. Once the seeds emerge, remove the sheet of glass or cling film.

  7. 7

    Transplant the Johnson's Blue Geraniums when they have grown to a manageable size; typically, as soon as they have developed one to two sets of leaves. Germination depends on growing conditions but typically is 21 days to two months.

Tips and warnings

  • Iowa State University recommends growing geranium seedlings under florescent lights. Set the growing containers 4 to 6 inches from a florescent light for 12 to 16 hours daily.
  • According to Iowa State University, the ideal temperature for geraniums is 21.1 to 23.8 degrees C during the day and 15.5 to 18.3 degrees C at night.

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