Garden Blog - Top Tropicals

Date: 7 Aug 2025

Blackberry Jam Fruit - the sweetest surprise

A  tuxedo  cat  making  jam  from  Blackberry  Jam  Fruit  (Randia  formosa)  while  an  orange  cat  smiles  in  a  chair,  sipping  tea  beside  a  large  flowering  Randia  plant  in  a  cozy,  sunlit  room.

Tea and Jam with the PeopleCats – A Tropical Afternoon Beneath the Randia

Meet the cats behind the jam! The tuxedo cat is none other than Google-the-cat - our beloved elder and one of the original cat-fathers of Top Tropicals PeopleCats.garden. At 18 years old, he’s still sharp, curious, and very much in charge. The orange fluffball? He represents the universal image of cat joy - and we’ve got a few real-life orange sunshine residents just like him.

Why do you include cats in a plant newsletter?

Because they’re part of the garden. Our rescued PeopleCats live among the plants, nap under the mango trees, inspect new arrivals, and occasionally steal a sunspot meant for seedlings. They’re not mascots — they’re part of our team. Sharing their presence is like showing a part of the soul of our space.🐈

Are the cat images real or AI-generated?

All our cats are real! We take lots of pictures and videos. And a few images are AI-generated illustrations inspired by our real PeopleCats.garden residents. While not literal photographs, they are creative interpretations that capture the spirit of our tropical home and its furry citizens.🐾

Are the stories about the cats true?

Mostly! The jam-making, tea-drinking, and greenhouse meetings are creative interpretations - but inspired by real personalities. We use AI scenes to bring their spirit to life. Real cats. Real plants. Imagined adventures.🐱

Watch Top Tropicals videos about PeopleCats

Shop Blackberry Jam Plants

Date: 7 Aug 2025

Randia  formosa  shrub  in  bloom  with  white  star-shaped  flowers,  close-up  of  single  bloom,  and  ripe  yellow  fruit  with  black  pulp  that  looks  like  blackberry  jam

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

Date: 2 Apr 2026

Skip the Egg Hunt - Start a Plant Hunt 🐰

Smokey  the  black-and-white  cat  with  glasses  sits  on  a  patio  taking 
 notes  while  Sunshine,  a  fluffy  orange  cat  wearing  bunny  ears,  holds  a  small 
 potted  mango  tree  with  light  yellow 
 flowers.
Sunshine: I went egg hunting. Found something better. Let’s grow it on the balcony. Mango-filled donuts, here I come.

Smokey: Finally. You’re thinking.

Read more about Smokey & Sunshine

Groundhog said long winter… and it sure felt like it. But now it is finally over, and balconies and patios are waking up again.

Easter is here, and with it comes that fresh start feeling - time to open the doors, bring plants back out, and start growing.

We made it through the cold. For northern gardeners, that is every year; for borderline zones, it is a reminder that freezes happen. That is exactly why growing in pots makes sense - you stay flexible.

Container growing is not just about pots - it is about choosing the right plants. The best options stay manageable, produce well, and handle being moved.

Let's look at what works. Start with plants that naturally stay compact and adapt well to containers. These are the ones that won’t outgrow your space and will reward you quickly. These are proven performers in containers - compact, productive, and easy to manage:

Simple rule: if it stays compact and handles pruning, it works in a container.

Skip the egg hunt this year - go on a plant hunt instead. Start with one or two plants this Easter - not ten. Get them established, learn how they grow, and then expand.

Container basics (keep it simple):

  • Pot size: start with 3–7 gallon, upgrade as plant grows
  • Soil: fast-draining mix (never heavy garden soil)
  • Water: soak well, then let top inch dry
  • Feeding: consistent light feeding works better than heavy doses
  • Sun: most tropicals want full sun (6+ hours)

🐣 Browse our Easter Container Collection

Randia  formosa  (Blackberry  Jam  Fruit)  showing  yellow  ripe  fruits,  some 
 cut  open  to  reveal  glossy  dark  pulp 
 inside.

Randia formosa - Blackberry Jam Fruit

Bunchosia  argentea  (Peanut  Butter  Fruit)  showing  clusters  of  red  ripe 
 fruits  on  a  leafy 
 branch.

Bunchosia argentea - Peanut Butter Fruit

Myrciaria  cauliflora  (Jaboticaba)  tree  with  clusters  of  dark 
 purple-black  fruits  growing  directly  on  the 
 trunk.

Myrciaria cauliflora - Jaboticaba

Eugenia  brasiliensis  (Grumichama)  with  red  ripe  cherries  hanging  from  a
    branch  against  blue 
 sky.

Eugenia brazilensis - Grumichama and more Eugenia Cherries

Date: 12 May 2025

Here is how Blackberry Jam comes from Gardenia

Randia formosa - Jasmin de Rosa, Blackberry Jam

Here is how Blackberry Jam comes from Gardenia

  • Did you know that Blackberry Jam Fruit Tree blooms like Gardenia?
  • Randia formosa, or Jasmin de Rosa is a unique small evergreen tree or bush that offers both beautiful, fragrant flowers and delicious fruit.
  • The fruit, with its rich, sweet flavor, tastes just like fresh blackberry jam, making it a delightful treat right off the tree.
  • Its white flowers, which resemble those of gardenias, fill the air with a pleasant fragrance.
  • Native to tropical regions, this plant is the perfect choice if you're looking for something unique and useful in your garden. Its fruit can be enjoyed fresh or used to create delicious jams and desserts, making it a great addition to both ornamental and edible landscapes.


📚 Learn more from previous posts:



🛒 Elevate your garden with fragrance and flavor of Blackberry Jam Fruit

#Food_Forest #Fun_Facts #Perfume_Plants

🔴 Join 👉 TopTropicals

Date: 16 Feb 2019

Featured plant. Randia formosa - Blackberry jam fruit

TopTropicals.com

Randia formosa - Blackberry jam fruit

This unique compact plant, perfect for container culture, combines features of a fragrant flower and tasty desert fruit. Kids love it! Originally from Central and South America, this rare tropical small evergreen tree bears fruit which tastes like fresh Blackberry jam. Many claim that it's even better than preserves. Closely related to the gardenia, its flowers are sweetly fragrant. This relatively hardy tropical has attractive foliage and can be grown in a container as well as in the ground. The Randia formosa (or Rosenbergiodendron formosum) produces as many as 25 to 30 fruits at a time. Since it blooms for a few months in the fall and winter, fruiting and flowering can be enjoyed when many other plants are dormant. Large tubular white flowers that attract nocturnal moths... Read more about this plant...

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