Truth about Blackberry Jam: it comes from Gardenia!
Randia formosa - Blackberry Jam Fruit, Jasmin de Rosa is a curious small evergreen tree from South America that combines features of a fragrant flower and delicious dessert fruit which tastes like fresh Blackberry jam. Fragrant white flowers are similar to Gardenia.
This relatively hardy tropical can be grown in a container as well as in the ground. It's very сompact (4-5 ft), perfect for container culture, will fruit in a container.
Kids love the fruit! Many claim that it is even better than Blackberry preserves.
Large tubular white flowers attract nocturnal moths. Since the plant is closely related to the gardenia (Rubiaceae plant family), its flowers are sweetly fragrant.
Produces as many as 25-30 fruits at a time. Since it blooms for a few months from Summer through Winter, fruiting and flowering can be enjoyed even when other plants are dormant.
Q: I am long time customer of yours, I live in San Diego
California and while the summer and Fall temperatures are warm to mild, the winter
temperatures dip to a point where some tropicals die off. We are experimenting
with different variations of way to heat and insulate the pots we have the
tropicals planted in as a way to keep them alive during the colder winter
months. I was wondering if you knew of the ideal soil temperature for these
tropical in order to look their best year round. All of the heaters we have
installed have thermostats and temperature adjustments so we can now keep the soil
anywhere between a range of between 65-75 degrees. Any advise you can provide
would be greatly appreciated.
A: This is a very interesting concept you are working with.
Indeed, keeping pots/roots warm, may help a lot! We've been experimenting with
cold protection for a long time - for the above-ground plant parts. For sure
keeping roots protected (even with a thick layer of mulch) will benefit tropical
plants during winter. In case with container plants, this may help
dramatically.
The guideline is, tropical plants slow down or stop their metabolism at
65F. As long as you can keep soil above that temperature - this should work
great. Of course, the higher the better.
Optimum temperature for growing tropical plants in general - 70-85F.
Above 90F, metabolism stops too, unless it's a heat tolerant, desert
plant.
More information on winter cold protection of tropical plants and
zone pushing:
🌈 Compact Bauhinias - everblooming container trees
📸 Pictures for the previous post, Bauhinias:
Bauhinia madagascariensis - Red Dwarf Orchid Tree. Blooms from winter through fall, up to 10 months a year. The most cold-hardy of all.
Bauhinia blakeana - Hong Kong Orchid Tree. A large tree in the ground, but compact in pots if trimmed. Grafted trees flower right away. Winter bloomer, cold hardy to light frost.
Bauhinia tomentosa - Yellow Orchid Tree. Flowers from Winter through Summer, cold hardy to light frost.
Bauhinia monandra - Napoleon's Plume Orchid Tree. Almost everblooming with the longest flowering period (less cold hardy than the first three).
Bauhinia acuminata - Dwarf White Orchid Tree. Blooms from summer through winter (also less cold hardy than the first three).
Sapodilla - Manilkara or Achras zapota, the Brown Sugar Fruit
🍊 How to make Sapodilla fruit profusely?
Sapodilla - Manilkara or Achras zapota), the Brown Sugar Fruit is a warm-climate evergreen fruit tree that can produce a lot of fruit once conditions are right. So why do so many sapodilla trees grow beautifully, flower heavily, and still refuse to set fruit?
Sapodilla Fruit Production - What Really Matters
1. 🌳 Choose the Right Tree
Grafted or air-layered trees fruit much sooner - typically in 1-2 years - and more reliably than seedlings, which may take 6–8+ years.
Some varieties are more profuse producers than others. For example, Silas Woods is virtually everbearing, Hasya is commercial prolific producer, Oxkutzcab (or Ox) -is also heavily productive (learn more about varieties).
2. ☀️ Environment: Heat, Sun & Water Balance
Temperature and Humidity
Excessive heat above 90F and low humidity can cause flowers to dry up and fall before setting fruit.
Solution: Provide filtered light or shade during the hottest part of the day to reduce heat stress on blossoms.
Water
Sapodillas are drought tolerant, but consistent moisture during flowering and fruit set improves fruit retention.
Avoid waterlogged conditions - soggy soil can stress roots and reduce yield.
Sun Exposure
Full sun is best for growth and flowering - but for hot climates, protection during peak afternoon heat helps reduce flower drop.
Young trees can also suffer sunburn.
3. Fertilization: Feed for Fruit, Not Just Foliage
Good nutrition is critical for flowers to turn into fruit. Apply a routine feed through the growing/flowering season - contolled-release (Green Magic) or liquid (Sunshine C-Cibus) both work.
Balanced fertilizer with trace elements like Boron (B), Molybdenum (Mo), Iron (Fe), and Copper (Cu) is essential for fruit set and development. Boron & Molybdenum deficiency as a frequent cause of flower/fruit drop in container-grown trees (nutrients get depleted quickly in pots).
Micro-nutrient sprays 2-3 times per year help improve fruit retention and quality. Some growers use sugar boosters (Sunshine Honey) or micronutrient blends that include Mo & B to help fruit set (Sunshine Superfood).
4. 🐝 Pollination - Often Overlooked
Sapodilla flowers are small and often require pollinators for best fruit set.
In some regions, small insects like thrips are key pollinators.
In places with low insect activity, hand pollination dramatically increases fruit set - brushing pollen from one flower to another with a small paintbrush during peak bloom times can help.
Placing fruit scraps (apple peels/banana peels) under the tree to attract beetles is an inexpensive way to boost insect activity.
5. ✂️ Pruning and Tree Structure
Moderate pruning can help open the canopy for better light penetration and air circulation, which supports flowering and reduces stress. Training young trees promotes a strong branch structure that can carry more fruit later. Sapodilla flowers on young growth (tips of the branches).
6. Pot vs Ground: Size Matters
If your sapodilla is in a container, root bound trees struggle with fruit set because roots run out of space and nutrients - stepping up to a larger container or planting in the ground can help.
Root-bound trees often bloom but fail to develop fruit.
7.
📅 Patience & Timing
Even healthy trees can take years to start fruiting well.
Trees often flower repeatedly but only set fruit when environmental conditions and pollination align - especially important for young or newly planted trees.
📌 Summary Checklist for Better Sapodilla Fruiting
✔️ Choose a grafted variety (faster, more reliable fruit).
✔️ Manage heat & humidity - shade during hot hours.
✔️ Water consistently but avoid waterlogging.
✔️ Fertilize balanced NPK + micronutrients (include B & Mo).
