African violet
Botanically, this plant is closer to streptocarpus and gloxinia than to Viola: Streptocarpus ionanthus belongs to the gesneriad family, not the violet family. Indoors, it is recognized by its fuzzy leaf blades and flower stalks rising above the rosette.
Name and classification
Botanically, this plant belongs to Gesneriaceae, not the violet family. Under current classification, the species belongs to the genus Streptocarpus, so its correct Latin name is Streptocarpus ionanthus.
The name “Usambara-violet” comes from the Usambara Mountains and the flowers' resemblance to Viola; the name “saintpaulia” is linked to Baron Saint Paul, who brought the plant to botanists' attention in the late 19th century. The common name does not indicate a botanical relationship with the violet family.
Rosette, leaves, and flower stalks
The plant forms a short stem with a basal rosette. The stem does not extend far into the potting mix, so it is important not to plant the rosette too low when repotting.
The leaf blades are fleshy, rounded, and covered in fine hairs. Young leaves have denser hairs, while older leaves are noticeably less hairy; the undersides of the leaves and the stem may have a reddish tint.
| Plant part | Feature |
|---|---|
| Stem | short, 5-8 cm |
| Leaf blade | 13-55 × 10-40 mm |
| Flower stalk | 50-60 mm |
| Inflorescence | raceme with 2-4 flowers |
| Corolla | about 25 mm in diameter |
Origin and natural habitat
The species is native to the mountains of Tanzania and Kenya. In the wild, the plants grow in moist mountain habitats, including river terraces and areas near waterfalls where there is fog and water spray.
This origin explains its indoor requirements: the plant grows better with gentle light, steady warmth, and moderate moisture in the potting mix. Constantly wet roots are as undesirable as letting the rosette dry out.
- indirect light without harsh direct sun
- a warm spot without sudden temperature changes
- higher humidity around the plant without wetting the leaves
Light, temperature, and placement
Bright indirect light is needed for growth and flowering. At an east- or northeast-facing window, the rosette usually receives enough light without overheating; at a south-facing window, shade is needed in summer.
In insufficient light, the leaves stretch and fewer buds form. If natural light is limited, use supplemental lighting; African violet growing references mention a day length of at least 12 hours and lights placed 25-30 cm above the plant.
- east-facing window
- northeast-facing window
- south-facing window with light shade
Watering, potting mix, and repotting
Water when the top layer of potting mix has dried. Use soft, room-temperature water that has been left to stand; cold water and standing water in the saucer increase the risk of root rot.
The least risky method is bottom watering through the saucer, then emptying any remaining water after 20-30 minutes. Watering from above is possible, but water must not reach the center of the rosette or the fuzzy leaf blades.
- a light potting mix for gesneriads or African violets
- drainage holes in the pot
- repotting without burying the center of the rosette
- added perlite or vermiculite for aeration
- removal of old lower leaves when rejuvenating the rosette
Flowering, cultivars, and dormancy
The wild form has violet-blue flowers without a noticeable scent. Bred forms vary in flower color and structure: white, pink, reddish-purple, dark blue, double, edged, and other forms occur.
Flowers appear on stalks in the leaf axils and are grouped in racemes. Growth may slow in fall and winter, so water more cautiously and reduce or stop feeding.
| Feature | Variation among cultivars |
|---|---|
| Color | from white and pink to dark blue |
| Flower shape | classic, star-shaped, double |
| Petal edge | solid-colored or edged |
| Rosette size | from miniature to large forms |
Propagation and common problems
The plant is most often propagated from a leaf cutting. Take a healthy, fully developed leaf: wilted material is more likely to rot before roots form.
- trim the leaf stalk to 3-4 cm
- root in water or loose potting mix
- insert the cutting no deeper than 1.5-2 cm
- maintain a temperature no lower than +20…+22 °C
- allow 1-2 months for plantlets to develop
Common problems are linked to water and ventilation: root rot, damage at the base of the rosette, and powdery mildew. Reported pests include whiteflies and cyclamen mites, so keep new plants separate until they have been inspected.
- Light
- bright indirect light
- Temperature
- +18…+24 °C
- Watering
- when the surface dries
- Soil
- loose, well-drained
- Difficulty
- moderate
- Cats and dogs
- safe
- Size indoors
- rosette 20-40 cm
- Leaves indoors
- 13-55 × 10-40 mm
- Native range
- mountains of Tanzania and Kenya
Care
African violet needs stable conditions: gentle light, a warm spot, and careful watering without standing water. Most mistakes involve wetting the fuzzy leaves or using overly compacted potting mix.
- Light
- Provide bright indirect light. An east- or northeast-facing window is suitable. At a south-facing window, provide light shade from direct sun in summer.
- Temperature
- Keep at +18…+24 °C. Keep warm during the growing season, without sudden temperature changes. Do not let temperatures fall below +16 °C: cold slows growth and increases the risk of rot.
- Watering
- Water when the surface dries. Use soft, room-temperature water that has been left to stand. Empty excess water from the saucer after 20-30 minutes.
- Soil
- Use a light, loose potting mix. Use an airy potting mix with drainage. African violet mixes with perlite or vermiculite are suitable.
- Feeding
- Feed every 2 weeks. Feed during active growth and flowering. In winter, when growth slows, reduce or stop fertilizing.
- Support
- No support needed. The flower stalks support themselves. It is more important not to bury the center of the rosette when repotting or compact the potting mix.
- Leaves
- Keep leaves dry. The fuzzy leaf blades do not tolerate water droplets well: spots and fungal infections may develop.
- Repotting
- Repot once a year. Repot into fresh, loose potting mix when the rosette outgrows its pot or the mix has become compacted.
Botany
3 ill.- Family
- Gesneriaceae
- Genus
- Streptocarpus
- Species
- Streptocarpus ionanthus
- Author and year
- (H.Wendl.) Christenh.
Streptocarpus ionanthus is a member of Gesneriaceae with a short stem and a basal rosette of hairy leaves. The leaf blades are fleshy and rounded, sometimes with an asymmetrical, heart-shaped base.
The species comes from the mountains of Tanzania and Kenya. Natural conditions with gentle light, fog, and water spray explain the plant's sensitivity to direct sun, drying out, and standing water.
Flowers form on stalks above the leaves and are grouped in racemes. The fruit is a hairy capsule containing numerous small seeds, but cultivars grown indoors are usually propagated vegetatively.
How it differs from similar plants
Gloxinia Sinningia speciosa
- Gloxinia has much larger leaf blades, 8–24 cm, and bell-shaped, velvety corollas, while African violet is recognized by its smaller, fuzzy leaves in a rosette and flower stalks above it.
Frequently asked questions
- Why isn't it flowering?
- Most often, the plant lacks light or receives too much nitrogen. Move it into bright indirect light and feed with fertilizer for flowering plants during the growing season.
- Why are the leaves turning yellow?
- The cause may be overwatering, depleted potting mix, or the natural aging of lower leaves. If the center of the rosette turns yellow, check the roots and watering routine.
- How should I water it?
- It is best to water through the saucer and empty any remaining water after 20-30 minutes. When watering from above, keep water off the leaves and out of the center of the rosette.
- Can I keep it at home if I have a cat?
- Yes, the plant is safe for cats and dogs. Even so, remove damaged leaves to prevent the rosette from rotting.
- How do I propagate it from a leaf?
- Take a healthy, fully developed leaf, leave a leaf stalk of 3-4 cm, and root it in water or loose potting mix. Plantlets usually develop within 1-2 months.
- Is it a true violet?
- No. African violet is unrelated to woodland violets (Viola)—it belongs to a genus in the gesneriad family, botanically classified as Streptocarpus since 2015. Thousands of cultivars are sold, rather than the wild form.
