🌿 Bring the Jungle Inside: Winter Survival Guide Part 2.Temperature. ❄️

Smokey: Too cold. We need more heaters so the plants feel comfortable.
Sunshine: I feel comfortable.
Smokey: You are not part of my plant collection, but I am glad you are comfortable.

🌡️ TEMPERATURE: THE TROPICAL DORMANCY LINE

In Part 1 (Winter Survival Guide: Temperature) we covered the foundation: light, placement, and acclimation. That is the survival layer.

Most tropicals stop growing below 70 to 75 F. They stay green, but their engine shuts down.

Below 70F:

• Water intake drops.
• Roots slow down.
• Fertilizing becomes risky.
• Root root becomes easy.

If you WANT your plants to grow in winter, you must take care of everything: Warmth, light, humidity, water. It all works together.

• Aim for 75 F with bright light. Water lightly. No fertilizer.
• Watch out for drafts. Cold windows. Door blasts. Garage entryways. Even one gust can trigger leaf drop.
• Vents are the opposite problem: hot, dry, dusty air. That gives you crispy edges and mites.
Root zone temperature matters just as much as room air. Your thermostat may say 72 F, but your pot on a tile floor may be sitting at 55 F. Fix this by elevating pots on boards or stands. Use Styrofoam. Never keep pots directly on cold tile o windowsill
• Extra winter heat: Space heaters are fine if used smartly. Do not blow hot air directly on plants. Keep heaters away from cords, trays, and water. Oil filled radiators are the safest option for plant rooms.
• Use a humidifier if you want growth or want to prevent spider mites. But do not blow mist directly onto leaves. Always place the unit lower than the plant canopy.
• Grouping helps. Put tropical plants close together to share humidity. Do not mix succulents with humidity lovers.
• Cats and dogs love to knock over lights and stands. Secure your fixtures. Trust us.
• Airflow: Light airflow is healthy. Direct fan blast is not. Still, dry corners invite mites.
• A mild night drop is OK. A big one below 55 F will stop growth completely.

A mandevilla thriving indoors with bright pink blooms and glossy green leaves.

☂️ PLACEMENT: MICROCLIMATES RULE EVERYTHING

Indoors is one big tradeoff: light but cold near windows, warm but dim away from them. The winning combo is a warm room with supplemental light.

Best zones to keep plants in winter:

• South or east windows with additional light
• Warm living spaces
• Bright bathrooms for natural humidity

Worst zones to keep plants in winter:

• Behind curtains
• Directly on windowsills
• Near heaters or vents
• Against cold exterior walls
• Dark corners without supplemental lighting

A vigorous indoor philodendron stretching across the window.

💨 ACCLIMATION

Moving a plant from outdoors to indoors is a shock. Light drops. Humidity drops. Airflow stops. Soil cools. Even healthy plants may drop some leaves for a few weeks. That is normal.

Before you bring them inside:

• Rinse foliage to remove dust and pests. We recommend Sunshine NoBug - and organic, safe solution.
• Check for ants.
• Trim weak branches.
• Treat soil if fungus gnats are present.

Try to bring plants inside before the first cold front, not after. If you are reading this too late, do the prep now and expect a little leaf drop.

If you nail light and temperature, winter becomes simple. In the next mail-list we will cover watering, fertilizer timing, humidity, and other indoor tricks that keep tropicals happy till spring. Stay tuned.

Cat Bob is inspecting his indoor garden around the tub with a bright skylight

✔️ WINTER INDOOR FAQ: TEMPERATURE AND PLACEMENT

Q: Why are leaves dropping only on the window side?
A: Cold glass. The room may be warm, but the glass surface can be much colder.

Q: Is a cold room OK for tropicals?
A: They may survive, but they will not grow below about 65F to 75F. When nights stay below 65F for a week, many plants enter dormancy.

Q: My room feels warm. Why is my plant still not growing?
A: Check the soil temperature. Pots on cold tile can be 10 to 20F colder than the air.

Q: Can plants sit directly on the floor?
A: Not on cold tile. Always elevate them on boards, stands, or trays.

Q: Is it OK to keep plants near a heater or vent?
A: No. Vents and heaters blast hot, dry air and cause crispy leaves and mites.

Q: My plant is dropping leaves after coming indoors. Why?
A: Normal acclimation to reduced light and humidity right after the move.

Q: Can I keep plants in a bright bathroom?
A: Yes. Bathrooms can have good humidity. Just keep pots off cold tile.

Q: Do I need a humidifier?
A: Not for survival. Yes if you want better growth and fewer pests like spider mites.

Q: Do I need a grow tent?
A: No. A bright LED plus a warm room is enough for winter holding.

Q: Should I fertilize in winter?
A: Not now. Winter fertilizer rules will be covered in the next mail-list.

Q: Should I water the same as in summer?
A: No. Indoor plants need much less water in winter. Watering rules also coming soon.

🛒 Shop Indoor Garden

📚 Learn more:

• Bring the Jungle Inside: Winter Survival Guide Part 1: Lighting
• SUNSHINE NoBug - Natural Plant Protector
• How to overwinter tropical plants indoors
• Feeding indoor plants
• Overwintering Adeniums outside of tropics
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🌸 Why adenium?

• Easy to grow in containers
• Thrive in sun or shade, indoors or out
• Tolerant of low humidity
• Very low water needs
• Forgiving plants that tolerate missed watering
• Long-lived plants that improve with age
• Compact size, ideal for patios, balconies, and windows
• Form unique, sculptural caudex shapes
• Decorative even when not in bloom
• Produce stunning, long-lasting flowers
• Often blooming in a few months

🌸 Adenium Care Basics

Adeniums have many spectacular hybrids, and their basic culture is closer to orchids than to typical houseplants. The key is a small pot, excellent drainage, bright light, and careful watering.

Pot and Soil

• Use a small pot sized to the root system.
• Excellent drainage is required.
• Use a very well-drained mix. We recommend specially formulated for Adeniums Desert Rose Soilless Mix

Light and Blooming

• Give lots of light for heavy flowering.
• In warm conditions and longer days, most hybrids and species begin blooming in spring.
• In warmer climates they can keep blooming through fall and winter.

Watering (Most Important)

• Adeniums dislike both extremes: over-watering and drying out too often.
• Use neutral to hard water when possible.
• Acidic water can sour the mix quickly and may cause root rot.
• Water in the early morning so the plant can drink through the day.
• Watering frequency can range from daily to every few days, depending on heat, light, and how fast the mix dries.
• Never let the pot sit in a saucer of water.
• Do not let the plant dry out too often, or it may go into early dormancy.
• Do not wet the leaves.

Fertilizer (Caudex + Flowers)

• To build a large swollen base/trunk (caudex), use a good quality fertilizer.
• A fertilizer that helps trunk swelling also supports flowering. The best choice for this is Sunshine Megaflor.
• Avoid fertilizers that are too high in nitrogen; choose a formula where the middle number is the highest.
• Never apply fertilizer directly on roots.
• Do not liquid feed a thirsty plant.
• Always water lightly first, then feed, to avoid root burn and leaf drop.

The Caudex "Secret" (Shaping the Base)

• At each repotting, lift the plant slightly so the upper roots are a little exposed.
• This encourages new roots to grow downward and helps create a thicker, more interesting caudex shape.

Multi-Grafted Plants (Important Note)

• Adenium hybrids can be multi-grafted with several colors/varieties on the same plant.
• The swollen base forms only when the rootstock plant is grown from seed.

✍️ Adenium FAQ

How much light do Adeniums need?

Adeniums need lots of light for heavy flowering. Most hybrids and species start blooming when conditions are warm and days get longer, and in warmer climates they can keep blooming through fall and winter.

What is the best pot size for Adeniums?

Use a small pot sized to the root system, with excellent drainage. A small pot with excellent drainage is a must.

What kind of soil mix should I use?

Use only a well-drained mix. Adeniums do best in very well-drained soil. A small pot plus excellent drainage is the foundation of success.

How often should I water Adeniums?

Adeniums do not like both over-watering and drying-out too often. Water preferably in the early morning and do not water again until the mix dries on the surface. Watering can range from daily to every few days depending on heat, light, and how fast the mix dries.

Can Adeniums sit in a saucer of water?

No. Never allow your Adenium to sit in a saucer of water.

Should I wet the leaves when watering?

No. Do not wet the leaves.

What kind of water do Adeniums prefer?

Adeniums prefer neutral to hard water. Acidic water tends to sour the soil too fast and may cause root rot.

How do I create a large, swollen caudex?

At each repotting, lift the plant slightly so the upper parts of the roots are a little exposed. This encourages the plant to form more roots that grow downward and helps create a thicker, more interesting caudex.

What fertilizer should I use for caudex growth and blooms?

Use a good quality fertilizer to support both trunk swelling and flowering. Avoid formulas that are too high in nitrogen; the middle number should be the highest. Never apply fertilizer directly on roots, and do not liquid feed when the plant is thirsty. Water lightly first, then feed, to avoid root burn and leaf drop.

Can an Adenium have multiple flower colors on one plant?

Yes. Adenium hybrids can be multi-grafted with several colors or varieties on the same plant. Note that the swollen base forms only when the rootstock plant is grown from seed.

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