Improving cold hardiness before winter: fertilizer and micro-elements

Q: I live in New Jersey and it is getting cool here, with temperatures in the upper 40s, but my tropical plant collection is in a heated sunroom (still around 70s). Should I continue fertilizing my plants? And if yes, my second question about deciduous Sugar Apple tree. Should I continue fertilizing it until it drops leaves?

A: First of all, even though you live outside tropical climate, your plants enjoy warm temperatures year round, and can be treated like if they were in a Southern garden.
Plant nutrients, both macro-elements (regular fertilizer) and micro-elements (such as iron, manganese, magnesium, copper, and other elements) play an important role not only in overall plant health but also in plant hardiness.
The rule of thumb is, even in warm climates we cut off any fertilizer by the end of October. You still have time for the last treatment this year (next will be in March, or when your plants start showing new growth). You may apply just a bit of slow-release granulated fertilizer, or water-soluble by foliar spray, diluted 1/2 of label strength, to all evergreen species in your collection.
The most important application before winter is micro-elements and other plant boosters that will help you plant collection survive winter months with a shorter daylight and cooler temperatures. Now it is a perfect time to make these simple steps:

1) Miscro-element applications, any one of: Superfood, Iron Supplement, Greenleaf.
2) Sunshine-T application: for improving cold hardiness, plus immune system resistance to insects and deceases.
3) Sunshine-Honey application for all fruit trees to encourage bigger and sweeter fruit next year.

Regarding your second question. Deciduous tropical plants like Annonas, Adeniums, Plumerias, etc - do not need regular fertilizer at this time, however, go ahead and apply microelements Superfood complex, as well as Sunshine-Honey, while leaves are still green. These two will give a kick-start to provide better flowering in spring, and production of sweeter fruit later.

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🌸 Caring for Winter-Blooming Trees

Tips from Top Tropicals Plant Expert - Tatiana Anderson

When northern gardens fade into gray, our tropicals wake up. Winter is color season here - and even if you live up north, you can still enjoy these same flowering trees indoors or on a sunny patio.

From the fiery Royal Poinciana to the golden Tabebuia and violet Jacaranda, these eight trees prove that winter can bloom anywhere

How to Care for Winter-Flowering Trees

We're often asked, at Top Tropicals, “Can I really grow tropical trees in winter?” Yes — with the right light and care, you can. Here’s what works best both outdoors and indoors, according to our expert, Tatiana Anderson.

🌡️ Fall Planting Guide

Let’s talk about timing, because that’s the part most people get nervous about. Everyone asks: “Isn’t it too cool to plant now?” — and the answer is no! Fall and early winter are actually the best months for tropicals in Zones 9 to 11.

Here’s why: the air has cooled off, but the soil is still warm. Roots love that combination. They quietly spread underground while the rest of the plant takes a break. By spring, those roots are ready to feed a burst of new growth — and that’s when you’ll see the first big flush of flowers.

Pick a sunny spot that gets plenty of light — six to eight hours if you can. Loosen the soil and mix in compost or pine bark so it drains well. Dig a hole about twice as wide as the pot and just as deep. Set the plant level with the ground, backfill, and water it deeply to settle everything in. Then add mulch — two or three inches is plenty — but keep it away from the trunk so it can breathe.

Tatiana’s tip: “Fall planting builds roots while everyone else is resting. By spring, your tree wakes up ready to grow.”

🌳 Outdoor Care (Warm Climates Zones 9–11)

Now, let’s talk about what happens after planting — because real gardening starts once the plant is yours. Tropical trees thrive on routine: steady sunlight, deep watering, and just a bit of attention.

Water them about once a week when the weather is mild, more often if it’s dry or windy. Always check the soil first — if it feels dry two inches down, go ahead and water. Mulch helps more than most people realize — it keeps roots cool in summer and warm in winter, and it saves you from watering as often.

Now, for those of you in Zone 9, here’s the truth: your trees can take a chill, but they don’t love surprises. A quick night in the upper 20s F won’t hurt mature plants, but young ones appreciate a little help — a frost cloth or being planted at the south side.

And don’t underestimate the wind. Cold, dry gusts can burn leaves faster than frost. Use fences, hedges, or taller shrubs as windbreaks, and take advantage of microclimates — those warm pockets next to the house, brick patios, or corners that get extra afternoon sun.

Tatiana’s tip: “A tropical garden in Zone 9 isn’t about fighting nature — it’s about cooperating with it. Find the warm corners, protect from the cold wind, and your trees will thank you with flowers all winter.”

🏚️ Indoor & Patio Care (Cooler Climates)

For our northern friends — yes, you can grow tropicals indoors! You just need good light, warm air, and a little attention.

Pick a large pot, with drainage holes and a light tropical soil mix. Place it in a bright window — south or southwest if you can — or under grow lights for about 12–14 hours a day. Keep temperatures between 65 and 85 F, and water when the top inch of soil dries out.

Misting helps keep leaves clean and adds humidity. Rotate the pot every couple of weeks so all sides get sun. In summer, move your plant outdoors gradually so it can enjoy real sunlight — then bring it back in before nights drop below 40 F.

Tatiana’s tip: “Don’t be afraid of growing trees in pots. They adapt beautifully — just select the right trees and pay attention to their needs.”

✔️ Learn more: Secrets of Winter planting - tropical planting breaks the rules.

🎥 Watch short videos about Winter Bloomers:

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👉 Explore Winter Flowering Plants