Garden Blog - Top Tropicals
Date: 15 Jan 2026
Date: 7 Aug 2025
Randia formosa - Blackberry Jam Fruit Tree with Flowers and Ripe Fruit
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, 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.
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.
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.
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.
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.
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.
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.
Randia formosa requires acidic, well-draining soil. Avoid alkaline soils, which may cause leaf chlorosis (yellowing with green veins).
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.
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!
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.
Yes, the white star-shaped tubular flowers have a light, sweet fragrance, similar to gardenias but less intense. The flowers open at night.
Yes. A single plant can set fruit on its own, although insect activity can improve fruit set.
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.
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.
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.
Once established, it shows moderate drought tolerance. However, young plants need regular watering and are more vulnerable to drying out.
Date: 16 Mar 2023
These two Champaka trees are of the same age, planted at the same time, 100 ft apart, with the same light, soil, and water amount... The only difference is - fertilizer schedule! The tree on the left is planted by our farm gate and gets pure water plus slow release fertilizer every 3 months. The tree on the right grows by our farm office with watering station hooked up to the Robuster active display. The Rubuster automatically dozes Sunshine Boosters liquid fertilizer with every watering.
Date of planting: 3/13/2022
The Robuster Started: 11/25/2022
Formula used: Sunshine C-Cibus 10 ml/gal with every watering
Drip irrigation: directly to the root zone once a day, 2-5 min
(weather adjusted)
Image taken: 3/15/2023 @ TopTropicals B-Farm (Sebring)
In the photo: The Robuster active display by our B-Farm office in Sebring, with the subject Champaka tree behind it that gets its food first come first serve!
The instructions for assembly are included and are straightforward, making it easy for online purchasers to put together. If you're capable of basic PVC plumbing, then assembling this system will be a breeze!
For a green, lush and fruitful garden that allows you to relax and enjoy your tropical paradise, the Robuster automatic smart fertilizer injector system is a must-have. It takes the hassle out of gardening, ensuring that it's carefree! Do you have any questions, need advice, or require assistance with installation? Simply contact us, and we'll be happy to help!
Date: 4 Jan 2023
To assist our customers in creating a happy and enjoyable gardening experience this year, we consulted with our horticulturist to compile a list of ten recommended items. Here are the results...
1. A favorite. Get yourself a favorite small flowering plant that is compact, manageable, and easy. Such as Ground
Orchid. Keep it in a pot or plant in the ground by the entryway where it can
be seen often and enjoyed.
2. A fruit of your labor. You need at least one (or one more) fruit tree for your
garden, or for container culture if you live in colder climate. Growing and
especially harvesting tropical fruit will make you happy. The Winner of the last
year was Cherry
Lolita - an easy, compact fruit tree that can produce almost year
around. Some fruit
trees will fruit right away!
3. Be exclusive. A rare plant is a must for every gardener. It can be a useful gem such as
Noni Tree
or an unusual-looking like a Bat Lily - Tacca. Show your friends and neighbors something different
they have never seen!
4. Make it cool. Finally plant that shade tree by your driveway. Yes it takes time to grow, but the sooner
you plant it, the sooner you get that shade! There are some fast growing species, some only take a couple of years to the mature
size.
5. Beauty. If you have an ugly fence or unwanted view in your yard,
cover it with a
flowering vine. Look at the beauty every day and make your life better.
Replace a boring standard hedge with colorful flowering shrubs that will make you smile.
6. Scent. Add some fragrant plants to your landscape and inhale their healing magic.
7. Tropical. For a shady corner, select a showy tropical with lush foliage such as Philodendron or Monstera, or
all time favorite
Banana. Get a feel of tropics.
8. Happiness of giving. Buy a gift plant for someone you care about but don't know how to thank them.
Live plant is the best expression of love and gratitude. If you are unsure
what plant to pick, ask our Team or simply buy a Gift Certificate that will never expire - let them chose the plant they
like.
9. Food for all. A set of quality liquid fertilizers is a must - try Sunshine Boosters that can be used year around. They will make your
plants healthy, strong, fast growing, cold hardy and disease-resistant. You can
choose formulas for different plant types from our selection, or simply buy online a Nutrition Kit of 8 bottles that will cover all your needs and save you
50% on fertilizer cost!
10. Share. Subscribe your friend to TopTropicals Newsletter so they can get a weekly Piece of Tropics in
their mailbox. Cool Cat Photos come as a bonus!
Make sure to always have on hand at least 2 main formulas of Sunshine Boosters - Robusta for vegetative growth, and C-Cibus that will satisfy plant needs for both fruit production and profuse flowering
Date: 25 Feb 2021
Q: I purchased two sweet red pitayas, that arrived and were planted on May 28, 2020, they were damaged but not serious. my question is this one pitaya is a beautiful green, and has grown 6or 8 "already, the other is bigger and is a grayish green and has not shown any sign of growth at all in six weeks, how long do I wait before I throw it out and buy another?
A: Being a cactus, sometimes Pitaya slows down its growth waiting
for more favorable conditions. If one of your plants doesn't show any new
growth, just give a it some more time and make sure the plant stays happy. To
make pitaya happy, provide the following:
- Water. Unlike most cacti, Pitaya prefers regular watering (but not
a wet soil). Make sure it is planted in well-drained media. Do not water
again if soil remains moist, wait until it dries out on the surface. During hot
weather, Pitaya enjoys light daily watering.
- Light. Unlike most cacti, Pitaya benefits from a filtered light
especially while establishing. Try to create a temporary shade over the plant
until it starts active growth (if grown in the ground), or move the pot in
filtered light. Dull color or dry spots are signs of sun burn. Once the plant
shows new growth, you may remove sun protection, or move the pot gradually into
the full sun.
- Food. Pitayas are heavy feeders. Use the following fertilizer:
SUNSHINE C-Cibus - Crop Nutrition Booster
Q: I've been growing dragon fruit cuttings from Okinawa, Thailand and Vietnam for several years in pots and cannot get them to fruit. Any fertilizer suggestions? I live in Northern Virginia so I bring the massive pots in the garage under lights and a heater for the winter but back outside once the temperature warms up.
A: There is a little trick to get Dragon fruit to flowering and
fruiting. This plant likes flowering when it is attached to a strong support.
In commercial plantations, they use special trellises/frames made out of
logs, but you can make one yourself using simple materials.
See article: Do-It-Yourself Support Structure for Dragon Fruit.
And of course, don't forget a special plant food for tropical fruit - Sunshine C-Cibus.
You can successfully get your Dragon fruits to fruit in pots, providing
bright light in Summer. In Winter, keep the plants on a dry side to give them
some rest and a chance to hibernate before the next fruiting season.
