How to grow Hibiscus trionum

Hibiscus trionum grow and care – shrub‎ of the genus Hibiscus also known as Flower of an hour or Bladder hibiscus, Hibiscus trionum annual and used as ornamental plant for the leaves and flowers, can grow in subtropical, mediterranean, temperate, desert or tropic climate and growing in hardiness zone 5+.

Leaves color green in rhomboid deeply lobbed shape.

Hibiscus trionum flowers

Flower color white to yellow, the inner part is red-bordeaux in trumpet shape.

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How to grow Hibiscus trionum growing and care:

Well drained soil

How to care:
Add fertilize at least once, put mulch to keep the soil moist, organic matter and humus

What is the best way to start growing?
Plant / Seed / Vegetative Reproduction – cutting

Is it necessary to graft or use vegetative reproduction?
No, it’s easier to start by seeds and not need to start by cutting, in cold climate it is possible to sow it in the winter indoor and start by cutting the end of the winter after the last frost to take it out

Difficulties or problems when growing:

Recommended planting season?
End of winter to summer in hardiness zone 10b, spring in hardiness zone 5-8, spring to summer in hardiness zone 9-10a but better in the spring

How to plant:
Dig hole bigger 50% more than the roots ball, add to the hole, organic matter, dead leaves and hummus put back some soil and mix it, after this put the plant cover lightly but strong enough that won’t fall put support for the plant if needed, if the plant is not stable consider to prune, water it twice in the first day and every day for two weeks.

Pests and diseases:
Nematode, galls, aphids, mealy bugs

Pruning season:
All growing season

How to prune:
Just for design

Size of the plant:
30-50cm, 12-20 inches

Growth speed in optimal condition:
Fast growing / Medium growing

Water requirement:
Average amount of water / Big amount of water (especially in the desert and in hot summer climate)

Light conditions in optimal condition for growing:
Full Sun / Half Shade (will bloom better in full sun)

Is it possible to grow indoor as houseplant?

Growing is also possible in pots, planter, flowerpot or containers:
Yes, when growing in container need at least 10-15L (2-3 gallons) can grow in bigger, soil can be potting soil, mixture of peat soil and perlite or other light mixed soil, water it regularly and care when put bottom for the pot be aware not to let the water stay there too many days, need to add humus, organic matter, fertilizer and mulch to cover the soil to keep it moist.

Blooming information

Bloom season:
Spring / Summer / Autumn

General information about the flower
Trumpet shape in white or yellow color, the inner part is red-bordeaux

Pollination is done by:
Bee, self-pollination

How to grow Hibiscus trionum from seeds

Sowing requirement:
Moist soil, temperature 15-26C (59-80F), humidity, full sun or half shade

Saving seeds and care until sowing:
Dry and dark location

Sowing season:
End of winter to summer in hardiness zone 10b, spring in hardiness zone 5-10a but better to do it by the temperature 15-26C (59-80F),

How to plant:
Plant in soil that stay moist and don’t let the soil dry

Planting spacing:
3*5cm to transplant and better not to transplant it before 5 leaves, direct it’s depend how the

Depth of Sowing:
0.5-1cm (0.25-0.5 inch) but cover lightly

Conditions for seeds germinate:
Full sun, moist soil

Watering requires for Seeds:
Average amount of water / Big amount of water

Germination time:
10-20 days

Condition of seedling:
After five leaves possible to add fertilizer, put mulch

Scientific name:

Hibiscus trionum

Alternative names: Flower of an hour, Bladder hibiscus, Venice mallow

How to grow Hibiscus trionum

Hibiscus trionum plant care

Hibiscus trionum flower

Hibiscus trionum


Blooming Seasons
  • Autumn flowers
  • Spring flowers
  • Summer flowers
Flower colors
  • Red flower
  • White flower
  • Yellow flower
  • Desert Climate
  • Mediterranean Climate
  • Subtropics Climate
  • Temperate Climate
  • Tropics Climate
Ornamental parts
  • Ornamental flower
  • Ornamental leaves
  • Ornamental plant
Plant growing speed
  • Average growing plants
  • Fast growing plants
Plant life-form
  • Annual plant
  • Herbaceous
Plant Uses
  • Ornamental plants
Planting Season
  • Spring Planting
  • Summer planting
  • Winter planting
Plants sun exposure
  • Full sun Plants
  • Part shade Plants
Watering plants
  • Big amount of water
  • Regularly water
Hardiness zone
  • Hardiness zone 10
  • Hardiness zone 11
  • Hardiness zone 12
  • Hardiness zone 13
  • Hardiness zone 5
  • Hardiness zone 6
  • Hardiness zone 7
  • Hardiness zone 8
  • Hardiness zone 9