Randia formosa - Blackberry Jam Fruit Tree with Flowers and Ripe Fruit

You know how some plants just surprise you?

That's Randia formosa - the Blackberry Jam Fruit Tree. At first, it just looks like a cute little gardenia-type shrub. Glossy leaves, sweet white flowers. Nice enough. But then the fruit shows up… and you crack one open and go, “Wait - this tastes like jam?!”

And not just any jam - like real, fresh blackberry jam. No sugar, no cooking. Just soft black pulp inside this golden little fruit. It's weirdly satisfying. One of those things you make everyone taste just to see their face.

What's even cooler is how easy it is. This thing starts blooming and fruiting when it's barely 2 feet tall. You can grow it in a pot on your porch, or even inside if it gets enough light. And while most of your other plants take the winter off, this one keeps going - flowers, fruit, the whole show.

If you've got a spot with filtered light and a little curiosity, it's absolutely worth a try. Honestly, it's just… fun.

This rare South American evergreen shrub checks all the boxes: fragrant, compact, easy, and edible.

✅ Grows in pots ✅ Indoors ✅ Small yards

Randia formosa – Blackberry Jam Fruit Tree – FAQ

What is Randia formosa?

Randia formosa, also known as Blackberry Jam Fruit or Jasmin de Rosa, is a compact tropical shrub that produces fragrant white flowers and small yellow fruits filled with soft, black pulp that tastes remarkably like blackberry jam. It belongs to the Rubiaceae family, the same as Gardenia and Coffea.

Why gardeners love Randia

• Delicious jam-flavored fruit – no sugar needed.
• Compact grower – perfect for patios and indoor spaces.
• Fast results – blooms and fruits within 1–1.5 years.
• Big yield in a small pot – 25–30 fruits at once!
• Fall–Winter performer – keeps going when others stop.
• Kid favorite – fun to grow, fun to eat.

What does the fruit taste like?

The pulp inside the fruit tastes just like fresh blackberry jam - sweet, tangy, and rich. It is edible fresh, without any processing or sweeteners, and is loved by both kids and adults.

How big does the plant get?

In the ground, Randia formosa typically reaches 4 to 5 feet tall. In containers, it usually stays smaller, around 3 to 4 feet, making it perfect for small gardens, patios, or indoor growing.

How soon will it fruit?

Very quickly! This is one of the fastest fruiting tropicals. Plants begin to flower and produce fruit within two years from seed. Еstablished plants in 3 gallon containers may begin fruiting at just 2 feet tall.

Does it need full sun?

No. It actually prefers filtered light or partial shade, especially in hot climates. Leaves tend to look healthier and greener when grown in dappled light.

Can I grow Randia formosa indoors?

Yes! Its compact size and shade tolerance make it an excellent choice for bright indoor spaces. Just be sure to provide good air circulation, high humidity if possible, and avoid cold drafts.

How cold-hardy is it?

Mature plants can tolerate temperatures down to about 26F for short period of time, but young plants are more sensitive and should be protected from frost. It is best grown outdoors in USDA zones 9b and up or kept as a container plant that can be brought indoors in winter.

What kind of soil does it need?

Randia formosa requires acidic, well-draining soil. Avoid alkaline soils, which may cause leaf chlorosis (yellowing with green veins).

How often should I water it?

Keep soil evenly moist but not soggy. It is sensitive to overwatering, especially in cooler weather. During winter, reduce watering. Underwatering may cause sudden leaf drop - but the plant usually recovers quickly once watered again.

What fertilizer does it need?

Yes. Use a slow-release fertilizer formulated for acid-loving plants. Regular applications of micronutrients (especially iron and magnesium) help prevent chlorosis. Foliar sprays can also be helpful. Apply Sunshine C-Cibus Booster or Green Magic controlled release fertilizer to keep your plant happy: Blackberry Jam Fruit is a heavy feeder!

When does it flower and fruit?

This plant can bloom and fruit for several months, often from summer through winter. It is known to bloom off-season, making it a fun and productive plant when others are dormant.

Are the flowers fragrant?

Yes, the white star-shaped tubular flowers have a light, sweet fragrance, similar to gardenias but less intense. The flowers open at night.

Is it self-pollinating?

Yes. A single plant can set fruit on its own, although insect activity can improve fruit set.

Are there any common problems?

The most common issue is chlorosis, which shows up as yellowing leaves with green veins - usually due to overwatering, poor drainage, or alkaline soil. It's fixable with acidification and micronutrients. The plant may also drop leaves suddenly if underwatered but tends to bounce back.

Is this plant related to Gardenia?

Yes. It is in the same plant family (Rubiaceae) as Gardenia and Coffee. That's why the flowers look similar and why it tolerates similar care needs.

Can it be used for bonsai or miniature tree styling?

Yes, due to its slow growth and branching habit, Randia formosa can be shaped into a miniature tree form and is quite attractive when trained.

Is it drought-tolerant?

Once established, it shows moderate drought tolerance. However, young plants need regular watering and are more vulnerable to drying out.

Read Garden Blog about Blackberry Jam Fruit

Get your Blackberry Jam Fruit

Healthy Plants: Q&A from Mr Booster

How to keep bugs away naturally?

Q: I started moving my tropical plant collection indoors as it's getting colder... And all of a sudden, I noticed bugs on leaves! I know for sure all my plants were bug-free when I kept the pots outside in my lanai. What happened? And how can I keep them clean and healthy without using any harsh chemicals? I have many edibles and herbs that I use in my cooking and prefer to stay away from insecticides. Any suggestions?

A: It is very common when healthy looking plants, once moved indoors for the winter, get insect infestations. The main reason is change of environment that puts a plant into stress and makes it susceptible to parasites and diseases. Just think about what a plant is missing, a whole combination of necessary conditions that provided a good life:
- Bring light -> light level reduced, so beneficial UV spectrum is gone
- Air circulation -> less wind = more bugs thriving
- Warm temperature -> from upper 80's in summer to 70's in your AC room
- Air humidity -> although humid air is believed to be causing some issues (for example fungus), however, reducing humidity overall puts a plant into stress and makes it more vulnerable.

Many gardener prefer to avoid chemicals, especially when it comes to treating edible plants and indoor collections. The solution to your problems is - Organic Solution!

SUNSHINE NoBug - Natural Plant Protector.
Shampoo for Plants - for both indoors and garden

SUNSHINE NoBug - is a natural solution to keep your plants healthy and bug-free without harsh chemicals. It is great for organic gardening and edibles, eco-safe and non-toxic for humans and pets. It kills, repels and prevents: spider-mites, mealybugs, whiteflies, aphids and many more. No wait time required - spray and play! And it smells like jasmine, forget stinky insecticides!
How does it work? Just look at these ingredients: Kosher Glycerine, Organic Coconut Oil, Organic Palm Oil, Oat Protein, Organic Soap, Horticultural Oil, Jasmine Oil, Water. Yum! But bugs hate it - they suffocate in it! This is why your plants will have NO BUGS with NoBug, that's it!

Directions are simple:

- Mix 100 ml (3-4 oz) with 1 qt (32 oz) of water, or 500 ml (16 oz) in 1 gal of water - for larger applications
- Spray foliage to drip point, including underneath leaves.
- Repeat the treatment in 7 days.
- As a preventive care, spray leaves once a month to keep insects away.
- You may use a paper towel saturated with this solution to wipe the leaves and remove residue from insects.
- Store at room temperature.

This poor Pepper plant was tossed into garbage can by a neighbor... it looked hopeless, infested with mealybugs. We saved it with NoBug ! In 2 days it perked up, and after 4 weeks its healthy and fruiting!