Sugar grains on leaves?

by Mark Hooten, the Garden Doc

Q: On my Stemmadenia tree I noticed tiny drops (like white sand grain or sugar crystals) and wonder if this is a disease or some kind of insect and what can I do about it?

A: Sometimes certain vigorously growing (mostly tropical) plants develop suspiciously-looking tiny "growths" mostly on the undersides of their leaves. Without strong magnification, they can be easily mistaken for mealy bugs, scale insects, or any number of parasitic disease vectors.
However, according to plant pathologists, these are actually harmless excretions actually exuded by the plants themselves. A chemical analysis of these tiny granules shows that they are nothing more than polysaccharides. Polysaccharides are basically complex chains of sugar/glucose molecules which are simply a production of all plants undergoing photosynthesis. Polysaccharides are at the beginning of the entire food-chain. These odd tiny sugar-grained nodules are actually only semi-crystalline complex sugars which certain plants have over manufactured and have had no choice but to excrete through their stomata (breathing pores).
I have personally observed Cecropia, Psychotria, Spondias (Hog Plum), and Guavas doing this... there are many others. Nothing to worry about, they are harmless, but if they bother you - wash them off with a hose water.

Which fertilizer is right?

Q: I need some advice on which fertilizer(s) would be perfect for my C​annonball tree and its cousin Heaven's Lotus (Gustavia augusta). ​I also have fruit trees... soursops, mango, etc. and a collection of flowers including pua keni keni, plumeria, bougainvillea, etc. I am wondering if you can recommend a custom fertilizing regimen for my garden (especially the cannonball and the gustavia since they are young).

A: It is a perfect time now to fertilize your plants as they start active growth. We have suggestions on fertilizing programs for your trees. You will find here our recommendations for:

1. Young trees
2. Flowering trees
3. Fragrant plants
4. In-ground grown fruit trees... CONTINUE READING >>

The most fragrant flowers

Q: Hope you can help me with the following question with an upcoming newsletter. Would you please let us know of the strongest (pleasant) fragrant plants you currently have in stock? Fragrance that fills the space.

A: The most fragrant flower that "fills the air around" in definitely Chanel #5 - Cananga odorata a.k.a. Ylang Ylang. Just one tree when in bloom can fill the air with fine perfume for yards away.
Another strongly scented perfume tree is Joy Perfume - Magnolia champaca (both orange and white flowers are sweetly fragrant).
If you are looking for a smaller size plant, then the most fragrant are -
- Jasmine sambac
- Night-fragrant white-flowered Brunfelsias - B. americana, B. nitida, B. Gigantea, B. lactea and others.
- Night blooming Jasmine - Cestrum nocturnum is another favorite shrub with night-fragrant flowers, the scent is super strong and super sweet.
- Artabotrys hexapetalus - Ylang Ylang vine with wonderful lemony fragrance that fills the air.

See Full list of fragrant plants.

When to apply super boost?

Sunshine Boosters: a breakthrough in Winter fertilizing

In the photo: plants are tough survivors. Life can't be stopped even by a brick road!

Q: Just wanted to know best time of day to apply super boost as spray and watering? Only listed to make sure night temp doesn't drop below 65F...

A: As a rule of thumb, plant's needs in fertilizers are very low in the cold season because they consume less nutrients during dormancy. For tropical plants, when minimum temperatures drop below 65F - we stop applications of dry (granulated) fertilizers until spring, to avoid root burn.
Liquid Sunshine Boosters are exceptions from this rule to a certain extent, for 2 reasons:
- they are amino-acid based which means, salts do not build up in the soil, and thus will not burn the roots even with slower plant metabolism.
- concentrations/formulas are mild and designed for as frequent as daily watering

Tips for winter fertilizing:

1) When a plant goes into full dormancy (drops leaves and does not show any new growth), you may stop fertilizing with any Macro NPK products (both dry and liquid)

2) If a plant is evergreen and continues growing during the cooler period, and especially if it is a winter bloomer, mild liquid fertilizers can be applied, depending on the stage of plant development.
Robusta and TotalFeed are used for vegetative growth and pre-flower.
Megaflor and C-Cibus are used for winter flowering/ fruiting plants during the bloom stage.

See full list of liquid boosters

3) Micro-elements can be used all year round for all plants that are not dormant (do not drop leaves)

4) Always use Sunshine-Epi as a foliar spray to activate immune system and unlock protective mechanisms, BEFORE applying other boosters. It is especially important during Fall-Winter for improving cold tolerance and disease resistance.

5) Always apply foliar spray and/or drench the soil with solutions in morning hours so the plant has time to process the nutrients during daylight when metabolism is the most active.

6) Avoid any dry fertilizers during winter

Best tasting white guava

Q: What's your best tasting white guava?

A: Our favorite white Guava is Viet Nam variety that is also very rare and hard to find. The fruit is very large, up to 6" in diameter, the pulp is very sweet and somewhat crunchy. The seeds are small which makes it more pleasurable to eat out of hand.
Another great feature of this variety, it stays compact and branches do not get leggy, unlike most guavas. It can be easily grown in a container, trimmed to the desired size and it will produce fruit under proper care.

Another cool variety is Indonesian, it also has a large round fruit and very few seeds to compare with others.

And last but not least, if you prefer soft fruit to crunchy, the Peruvian variety is a great choice. The fruit is pear-shaped.

Remember to provide plant food for good production, especially if grown in a container.

Fruit Festival Plant Food - Super Crop Booster
Mango-Food - Smart Release Fruit Tree Booster
SUNSHINE C-Cibus - Crop Nutrition Booster