Healthy Plants: Q&A from Mr Booster

Fertilizing in Winter

Q: I have many tropical plants in my garden, both in the ground and in pots. I realize it is wintertime and some of them, the Hydrangea, Hibiscuses, and roses are in bloom but the rest of them seem wilty and droopy. Is it alright to fertilize them now, or should I wait for a few days? I have an all purpose tropical fertilizer and a 20-20-20 also. Please advise what to do.

A: During wintertime, tropicals may suffer from low temperatures and lack of sunshine which causes droopy leaves, and leaf loss.
Regardless of the cause and plant condition, you should NEVER apply traditional dry fertilizers during cool months. When cold, dry fertilizers (EDTA-chelated) may create nutrient lock up in soil and damage the roots. Dry fertilizers (both granulated and water-soluble) can be used only during hot season - when min temperatures stay above 65F for at least a week in a row, and daytime temperatures are over 75-80F. During hot, active growth season plant metabolism increases. This provides less chance for a chemical root burn, as the nutrients are used up quickly.

However, liquid fertilizers, as long as they are amino-acid based, can be used year round. From our own experience last winter, we discovered that fertilizing sickly looking plants (with signs of cold damage and root issues) with Sunshine Boosters actually revived those plants. Sunshine Boosters even brought back to life some hopeless specimens. Take a look at this gardenia that grows in our garden (picture above). See full article.
In your case, it would be beneficial to use a mild formula of liquid boosters in combination with Sunshine Epi -a natural plant hormone that boost their growth and helps to cope with cold-, temperature- and low-light-related stress.

These are the products we recommend:
- Sunshine Bombino - add to every watering
- Sunshine Epi - twice a month as foliage spray

Since you grow plants in pots, feeding program is especially essential, because plants are limited with a container size where roots can't reach out to more food in the outer soil. In professional nursery set up with injector irrigation systems, container plants are fed daily (depending on season, more than once a day) with every watering. This is why greenhouse plants are so healthy looking.
So feel free to give your plants Sunshine boosters with every watering, dozing according to the label. During cold period, plants need less frequent watering, so fertilizer input will be balanced accordingly, it will depend on temperature and plant metabolism.

Featured plant. Randia formosa - Blackberry jam fruit

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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Best picks of the Season

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These plants are large, developed and beautiful NOW!

Hibiscus schizopetalus - Coral Hibiscus. Spectacular weeping tree hibiscus, rare and hard to find. Grows rapidly and blooms freely. Flowers look like parachutes and can be recognized by the fringed and lacy petals which are bent backward. It has slender and gracefully curved stems. Can be trained into a showy standard.

Cestrum nocturnum - Night blooming jasmine. Garden favorite - the sweetest fragrance at night is intoxicating. One of the most famous and desirable fragrant plants. Flowers are pale yellow to white, open at night and stay extremely fragrant until sunrise. These flowers are widely used in India and other countries of South Asia for perfumery, medicinal applications and in religious ceremonies. Best location will be near driveway, window or entrance, where the magic fragrance can be appreciated.

Juanulloa aurantiaca - Gold Finger plant, Mexican Spoon Flower - this one is soooo pretty! Unusual looking vine or shrub with yellow-orange fleshy flowers, everblooming and a VERY fast growing. Rare, collectible plant.

Tabernaemontana Flore Pleno - Crape Jasmine, Carnation of India, Florida Gardenia - this fast growing bush with waxy leaves and beautiful fragrant flowers is a must in tropical garden. Easy to grow and free flowering, dense bush.

Microsorum musifolium - Alligator Fern, Crocodile Fern from Australasia. Perfect for shade! An epiphytic fern with cool alligator-skin looking leaves. The strikingly shaped, light green fronds of the fern form a lovely backdrop to its stunning stiff, leathery, dark green alligator-skin foliage. Perfect as a houseplant, or planted under a tree. Grows to 2-3 ft in height and likes a sheltered, semi-shaded location, no direct sunlight.