Hoya krohniana ‘Black Leaves’ – Bold Foliage for Modern Spaces
Hoya krohniana Kloppenb. and Siar ‘Black Leaves’ is a compact, rare tropical plant known for its dark, heart-shaped foliage that turns nearly black under stress or high light. This striking cultivar brings contrast and texture to any plant shelf, with trailing stems and the potential for small, creamy-scented flowers over time. Perfect for minimal-care plant lovers, it thrives in bright, indirect light with just a touch of humidity.


Small size, big presence – why ‘Black Leaves’ stands out


 
Compact heart-shaped leaves: 2 – 4 cm wide, slightly succulent, with dark green to bronzed tones that intensify in bright light.
 
Low-growing and tidy: Trails gently or climbs with support, great for hanging pots or shelves.
 
Matte, textured finish: Unlike most Hoyas, these leaves have a velvety look instead of a waxy shine.


Where Hoya krohniana comes from (and how that helps indoors)


This species is native to lowland limestone forests in the Philippines. In the wild, it grows as an epiphyte on trees and rocks, soaking up filtered light and warm, humid air. That natural setup makes it easy to replicate in modern indoor conditions.


How to keep your Hoya krohniana thriving


 
Light: Bright, indirect light is ideal. Some morning sun is fine, but harsh midday rays can damage leaves.
 
Watering: Let 70 – 80% of the soil dry before watering. Less is more — overwatering is the top cause of problems.
 
Humidity: 60% or higher is best. Clustering plants or using a pebble tray can help in drier spaces.
 
Temperature: Comfortable at 18 – 26 °C. Avoid drafts or heaters.
 
Soil mix: Use orchid bark, perlite, and peat-free mix for airflow and drainage.
 
Fertilizing: Once a month in spring and summer with a balanced, diluted liquid feed.
 
Repotting: Every 2 – 3 years or when truly rootbound. Smaller pots help encourage blooms.


Will it flower? Here’s what to expect


It can bloom once mature. Flowers are tiny, creamy-white with pale pink coronas, and appear in clusters. The scent is soft and sweet. Don’t cut the flower stalks (peduncles) — they’ll bloom again from the same spot.


Propagating ‘Black Leaves’ the right way


 
Stem cuttings only: You’ll need at least one node. Leaf cuttings won’t root or grow into full plants.
 
Rooting: Use water, perlite, or sphagnum moss. Keep humidity high until roots develop.


Yes, you can grow it in LECA – with these conditions


 
Semi-hydro ready: It adapts well to LECA if humidity stays high and roots don’t dry out completely.
 
Oxygen is key: Rinse and aerate LECA well to avoid stagnant roots.


Common issues and what to do about them


 
Yellow leaves: Likely overwatering. Let soil dry more between waterings.
 
Dry tips: Often from low humidity or strong fertilizer. Dial back both.
 
Pests: Mealybugs and spider mites can show up. Treat with neem oil, insecticidal soap, or beneficial bugs.
 
Leaf drop: Can happen with sudden light or temp changes. Keep conditions steady.
 
Latex warning: Milky sap may irritate skin or eyes — rinse off if touched.


The best spot for this dark-leafed stunner


Place near an east- or west-facing window with indirect light for most of the day. Let it trail gently from a shelf or climb a compact trellis to show off those moody leaves.


Botanical background – and why it matters


Botanical name: Hoya krohniana Kloppenb. and SiarPublished in: Fraterna 22(4): 9 (2009)This cultivar, ‘Black Leaves’, isn’t an official grex — just a selection known for extra dark foliage. Named after Philippine plant collector Philip Krohn, this species is loved for its dense growth and compact size.


Answers to your most common questions


 
Does it bloom indoors?Yes — with time and bright, stable conditions, mature plants can flower each year.
 
Why is my plant turning green again?Lower light fades the dark coloring. Move it closer to a brighter spot.
 
Is it safe around pets?It’s non-toxic, but the latex can cause irritation. Keep out of reach.


Order Hoya krohniana ‘Black Leaves’ today


Add a subtle edge to your collection with this compact, low-maintenance Hoya. Shop now and enjoy dramatic foliage, reliable growth, and an easy-care vibe that fits any space.