The Story
Plant Bio
Hosta kiyosumiensis is a compact perennial herb known for its lush, broad, and ovate green leaves with a slightly rippled margin, and produces delicate lavender-purple flowers on tall, slender stems during summer.
This cultivar, DJH 423, is distinguished by its particularly dense foliage and early flowering habit, making it a desirable choice for shaded garden borders and containers.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Perennial
Height
18 inches
Width
24 inches
Light
Partial Sun, Shade
Zones
4, 5, 6, 7, 8, 9
Water
Moderate
Humidity
Prefers moderate humidity
Lifespan
Perennial
Native To
Japan
Toxicity
Toxic to dogs, cats, and horses
Bloom period
Early summer – Mid-summer
In flower about 2 months of the year
Planting
How to Grow
- Tuck dormant rhizomes 2 inches deep in prepared soil.
- Water thoroughly after planting to settle soil.
- Mulch around plants to retain moisture and regulate temperature.
- Fertilize in early spring with a balanced fertilizer.
- Divide every 3-4 years in early spring for best growth.
- Remove dead or damaged leaves throughout the growing season.
Pro Tip
Provide consistent moisture and partial shade for optimal growth.
Keep It Thriving
Care Guide
Do
- Water regularly to keep soil moist but not waterlogged 🌱
- Apply mulch to conserve moisture and suppress weeds
- Divide in early spring to promote healthy growth
- Fertilize with a balanced fertilizer annually
Don't
- Avoid deep watering late in the day ❌
- Don’t let soil dry out completely
- Skip fertilizing in mid-summer
- Do not place in full sun, which can scorch leaves
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Divide | ||||||||||||
| Fertilize | ||||||||||||
| Pest Check | ||||||||||||
| Spring Cleanup |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Multiply
Propagation Methods
Good to Know
Common Questions
Kiyosumi Hosta questions
What zones can Kiyosumi Hosta grow in?
Kiyosumi Hosta is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Kiyosumi Hosta deer resistant?
Not reliably. Deer may browse Kiyosumi Hosta, especially tender spring growth — plan on repellents or fencing where pressure is high.
When does Kiyosumi Hosta bloom?
Kiyosumi Hosta typically blooms in early summer through mid-summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Kiyosumi Hosta need full sun?
Kiyosumi Hosta does best in part shade.
More Hosta to compare
Blue Mouse Ears Hosta
Hosta cordifolia 'Blue Mouse Ears'
Patriot Plantain Lily
Hosta plantaginea 'Patriot'
June Hosta
Hosta fortunei 'June'
Fire Island Hosta
Hosta fortunei 'Fire Island'
Empress Wu Hosta
Hosta plantaginea 'Empress Wu'
Hosta Goldrush
Hosta x hybrida 'Goldrush'
Keep exploring
Explore the genus
Grow Kiyosumi Hosta with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.