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Mimulus Johnstonii, also known as Johnston’s Monkey-flower is a species of monkey flower.

Image of Mimulus Johnstonii at Google

Mimulus Johnstonii which is also known as Johnston’s Monkey-flower is a species of monkey flower.


• It is endemic to the Transverse Ranges of southern California.
• Here it is known to grow in the San Gabriel and San Bernardino Mountains.
• It grows in rocky and disturbed habitat, such as roadsides and scree.
• Mimulus johnstonii is an annual herb.
• This herb produces a thin, hairy stem.
• The stem can grow up to about 20 centimeters tall.
• The leaves are oppositely arranged and pointed.
• The leaves are oval in shaped.
• The leaves are about 1 to 3 centimeters in length.
• The flower is dark pink to magenta in color.
• There is a yellow spot and usually two purple spots in its throat.
• It is up to 1.5 centimeters long.
• There are five lobes at its mouth.

Growing/Caring conditions for Mimulus johnstonii – Johnston’s Monkey-flower

• Mimulus will grow best in full sun.
• The soil should be moist.
• These plants like to grow in wet ground.
• High temperatures and drying out in drought periods should be completely avoided.
• Plant out any time after May.
• Plant in late September for over-wintering plants.
• This will enable to flower early in the succeeding spring.
• Grow on plants under cover.
• When they reach a height of 8 to 10 cm, they can be transplanted outside.
• Mimulus are ideal for planting in containers.
• They thrive well in a pot.
• Fill the container up to three quarters full and add multipurpose compost.
• Carefully remove the plant from its tray.
• Fill container back in with soil and gently firm it down.
• Water generously.
• Let other plants not over-shade the mimulus as plenty of sun is required by these plants.
• Wash off any aphids that appear on these plants.
• Do it with a carefully aimed jet of water.
• If an infestation of aphids occurs, use an insecticidal soap to treat the problem.
• Cut back the plants once they are grown scraggly.
• Cut them at the end of the flowering period.
• Plant 6 to 12 inches apart.
• Fertilize once or twice during the growing season if desired.
• Pull up and discard plants in autumn after felled by frost.
• Plant the monkey flower seedling in full sun or partial shade.
• Plant them in well-drained soil.
• Cut off old leaves and stems using bypass pruners in early spring.
• Leave 4 to 6 inches of stems.
• Shear off old flowers with scissors.
• This will encourage more blooms.
• Mulch the soil around, but not on top.

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