Buying guide
Winter Care Kit
Updated How we research
Outdoor bonsai need cold to rest, but the pot is the weak point because roots freeze far faster above ground than they would in the earth. Plan for shelter, mulch or a cold frame, anchors so winter wind does not tip a tree off the bench, a dormant season pest treatment, and trays for the thaw when meltwater has to go somewhere. The page is split into six sections (Shelter and insulation; Species built for the cold; The classic hardy conifer; Dormant season treatments; Securing trees against wind; Catching meltwater), followed by every pick ranked by our score so you can compare them in one place.
The short version
We compared 24 picks. Our scores range from 5.5 to 8.2 out of 10.
- Best overall:Brussel's Satsuki Azalea Bonsai, 6 Year, Medium. Highest overall score in this guide at 8.2/10.
- Also great value:MUZHI Plastic Bonsai Humidity Trays, 11.5 x 8.3, 3. Value score of 9/10, overall 7.8/10.
- Solid build:Brussel's Live Satsuki Azalea Bonsai, Small. Build and materials score of 8/10, overall 8.0/10.
- Feature-rich:Bonide Captain Jack's Neem Oil RTU, 32 oz. Features score of 8/10, overall 8.2/10.
Scores are our editorial assessment, not customer ratings. How we score
Shelter and insulation
- Agfabric Plant Frost Covers, 120x120, 1.5 ozOur score7.8/10
- Plant Frost Covers with Drawstring, 2.5 ozOur score7.8/10
- Giantex Garden Cold Frame with ShelvesOur score7.6/10
- YFFSIDMY Plant Frost Covers, 8 x 40Our score7.4/10
Species built for the cold
- Brussel's Satsuki Azalea Bonsai, 6 Year, MediumOur score8.2/10
- Brussel's Live Satsuki Azalea Bonsai, SmallOur score8.0/10
- Brussel's Live Gardenia Outdoor Bonsai TreeOur score7.8/10
- Brussel's Small Satsuki Azalea Bonsai TreeOur score7.0/10
The classic hardy conifer
- Brussel's Live Mound Juniper Bonsai, 3 YearsOur score7.6/10
- Brussel's Green Mound Juniper Bonsai, 5 Years OldOur score7.4/10
- Brussel's Live Mound Juniper Bonsai, MediumOur score7.3/10
- Brussel's Green Mound Juniper Bonsai, MediumOur score7.0/10
Dormant season treatments
- Bonide Captain Jack's Neem Oil RTU, 32 ozOur score8.2/10
- Natria Neem Oil Spray, Ready-to-Use, 24 ozOur score7.6/10
- HARRIS Ready to Use Neem Oil Spray, 20 ozOur score7.6/10
- Garden Safe Neem Oil Concentrate, 10 fl ozOur score7.6/10
Securing trees against wind
- DeepRoot ArborTie Ground Anchoring Kit, AT HD15Our score7.5/10
- Pelican Rope Tree Guy Staking Anchor Kit, 3 PackOur score7.3/10
- Tree Guying Anchor Kit with 12 ft CableOur score7.3/10
- The Tree Guy Tree Anchor KitOur score5.5/10
Catching meltwater
- MUZHI Plastic Bonsai Humidity Trays, 11.5 x 8.3, 3Our score7.8/10
- Bonsai Boy Black Ceramic Drip Tray, 7.75 x 5.25 inOur score7.6/10
- Pinkunn Bonsai Humidity Drip Trays, 2 PackOur score7.4/10
- Yubonzai Ceramic Bonsai Drip Tray, BlackOur score7.3/10
All 24 picks, ranked by our score
Every product from the sections above, listed once. Sort by the criterion you care about most, or tick up to three to compare.
Brussel's medium Satsuki azalea bonsai, 6 years old and 8-10 inches tall, with pot and humidity tray for outdoor display.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 8/10 · Value 7/10
- + Medium size shows off more flowers than the small version
- + 6 years old tree has a fuller branch structure for spring color
- + Pot and humidity tray make it complete for display
- - Costs more than the small azalea for a modest step up in size
- - Flowering requires timing pruning right after blooms each year
Bonide Captain Jack's neem oil, a 32 oz ready-to-use spray that works as fungicide, insecticide and miticide.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10
- + Three-in-one action covers insects, mites and fungus
- + 32 oz ready-to-use bottle suits larger collections
- + Bonide is a widely stocked garden brand
- - Coating on foliage can look greasy for a few days
- - Not for use on stressed or freshly repotted trees in heat
Brussel's small Satsuki azalea bonsai, 5 years old and 5-8 inches tall, with bonsai pot and humidity tray for outdoor blooms.
Fit for the job 8/10 · Features and specs 8/10 · Build and materials 8/10 · Value 8/10
- + Satsuki azaleas give large spring flowers in striking colors
- + Humidity tray is included, which helps the fine roots stay moist
- + Small 5-8 inch size is easy to shelter on a patio in bad weather
- - Azaleas need acidic soil and soft water, which adds care steps
- - Outdoor tree that needs winter protection in colder zones
Agfabric's 1.5oz white plant cover, 120" x 120", for garden frost protection on cold nights.
Fit for the job 8/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10
- + 1.5oz fabric weight is stated, giving a clear warmth level
- + 120 inch square sheet drapes over a group of pots
- + Agfabric is a common name in garden frost cloth
- - Square sheet is less efficient for long, narrow benches
- - Frost cloth alone will not protect roots in a hard freeze
A reusable 7.9 x 6.6 Ft winter plant protector bag, 2.5 oz/yd2 fabric with a drawstring and zipper.
Fit for the job 8/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10
- + Zipper allows checking and watering without removing the bag
- + Drawstring seals the base against cold drafts
- + 2.5 oz/yd2 fabric is heavier than thin frost cloth
- - Large bag is oversized for a single small bonsai
- - Enclosed trees can overheat on sunny winter days if left zipped
Brussel's live gardenia bonsai, 4 years old and 6 to 8 inches tall in an 8 inch decorative container. An evergreen flowering alternative to azalea, with white or cream blooms listed for May through July.
Fit for the job 8/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10
- + Evergreen shrub with white or cream flowers, and the listing gives a bloom window of May to July
- + Stated specs: 4 years old, 6 to 8 inches tall, in an 8 inch container with soil and care instructions
- + Adds a second flowering species to a guide that otherwise leans on Satsuki azalea and maple
- - Not sold in Arizona, and the product page notes that the very strong gardenia scent can have an adverse effect on some people
- - Container color and style are assorted, so the pot will not necessarily match the product photo
MUZHI's 3 pack of transparent plastic bonsai humidity trays, 11.5 x 8.3 inch rectangles for pots and seed trays.
Fit for the job 8/10 · Features and specs 8/10 · Build and materials 6/10 · Value 9/10
- + Transparent trays blend into any shelf color without standing out
- + 3 trays at 11.5 x 8.3 inches handle several medium pots
- + Also useful under seedling trays and propagation pots
- - Clear plastic shows algae and mineral marks as it ages
- - Thin plastic can flex when carried while full of water
Giantex cold frame cabinet with a fir wood frame, transparent PVC panels, a flip-top roof and 3 adjustable shelves, measuring 28 x 16 x 52 inches. A sheltered spot to overwinter several small bonsai on a patio.
Fit for the job 8/10 · Features and specs 8/10 · Build and materials 7/10 · Value 7/10
- + Three adjustable shelves fit trees of different heights, and the 28 x 16 inch footprint suits a balcony or patio
- + Openable, adjustable roof and double doors with a lock give ventilation control and easy access to the trees
- + Transparent PVC sheets are described as offering light transmission, heat preservation and water resistance
- - The frame is coated fir wood, not aluminum like the cold frame it replaces, and it requires assembly
- - Panels are PVC sheet, and at 16 inches deep the shelves suit small and medium pots, not large trees
Brussel's small green mound juniper, 3 years old and 4-6 inches tall in a decorative container, an entry-level outdoor bonsai.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + Green mound juniper takes pinching well, so beginners can shape it early
- + Decorative container means the tree is ready to display on arrival
- + Small 4-6 inch size fits a porch step, balcony rail or outdoor shelf
- - Junipers need outdoor light and winter chill, so it will decline kept indoors
- - Young 3 year old trunk is thin and will take seasons to gain character
Natria's ready-to-use neem oil spray, a 24 oz bottle for pest and disease control in gardening.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + Ready-to-use spray needs no mixing or measuring
- + Neem oil treats both pests and fungal problems
- + 24 oz bottle is a practical size for indoor collections
- - Oil sprays can burn leaves if used in strong sun
- - Neem smell is noticeable indoors for a day or so
HARRIS's cold pressed ready to use neem oil spray, 20oz, for indoor and outdoor plants.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + Cold pressed neem retains more of its natural compounds
- + Ready to use for spot treatments on indoor bonsai
- + Suitable for both indoor and outdoor trees
- - 20oz bottle is smaller than competing ready-to-use sprays
- - Repeated applications needed to break pest life cycles
Garden Safe Neem Oil Extract Concentrate in a 10 oz bottle, a three-in-one fungicide, insecticide and miticide. A concentrate for growers who prefer to mix their own spray for houseplants and ornamental trees.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + Controls aphids, whiteflies and other listed insects, and also spider mites, according to the listing
- + Also works as a fungicide for black spot, rust and powdery mildew, so one bottle covers pests and disease
- + Listed for organic gardening and for use on houseplants, ornamental trees and shrubs, which covers bonsai
- - A concentrate, so you need your own sprayer and must dilute it according to the label before each use
- - The 10 oz bottle is smaller than the 16 oz size listed here before, so it makes less finished spray
Bonsai Boy's black ceramic humidity drip tray, rectangle 7.75 x 5.25 x 0.75 OD, for small display bonsai.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 8/10 · Value 7/10
- + Black ceramic tray gives a clean, understated display base
- + 7.75 x 5.25 inch size suits shohin trees and small indoor pots
- + Ceramic weight keeps the tray stable on smooth shelves
- - Shallow 0.75 inch rim holds only a little water after heavy watering
- - Only fits small pots, so larger trees need a bigger tray
DeepRoot's ArborTie heavy-duty ground anchoring kit with three 10 ft ArborTie straps and three 15 inch steel eye earth anchors.
Fit for the job 7/10 · Features and specs 8/10 · Build and materials 8/10 · Value 7/10
- + Steel eye earth anchors hold large in-ground trees securely
- + ArborTie strap is soft enough to protect bark from rubbing
- + Three anchor points give balanced support for tall trees
- - Built for landscape trees, so it is oversized for potted bonsai
- - Anchors need ground soil and cannot be used on benches
YFFSIDMY's white 8' x 40' frost blanket plant cover for freeze protection of outdoor plants and trees.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 6/10 · Value 8/10
- + 8 by 40 foot size covers an entire bench of wintering bonsai
- + Frost blanket traps ground heat on cold nights
- + Can be cut into smaller pieces for individual trees
- - Lighter frost fabric protects less in hard freezes, so layer if needed
- - Needs pegs or weights to stay put in wind
A medium Brussel's green mound juniper, 5 years old and 6-10 inches tall, sold in a water bonsai pot.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 7/10
- + Older 5 year stock has more branching to work with than starter trees
- + Water-style pot adds a decorative scene for gifting or display
- + Medium height gives enough foliage pads to practice basic styling
- - Water pot designs can hold moisture that junipers dislike if overfilled
- - Still an outdoor species, so it is a poor fit for an office desk
Pinkunn's 2 pack of plastic bonsai drip trays, 9.13 x 6.02 inch, simple saucers for catching water under pots.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 6/10 · Value 8/10
- + Two trays cover a pair of small to medium bonsai pots
- + 9.13 x 6.02 inch rectangle fits most common training pot sizes
- + Lightweight plastic is easy to lift and rinse at the sink
- - Plain plastic look will not suit a formal display area
- - No pebbles included, so it acts as a drip saucer by default
Brussel's medium green mound juniper bonsai, a live outdoor evergreen marketed as easy care for new growers.
Fit for the job 8/10 · Features and specs 6/10 · Build and materials 7/10 · Value 8/10
- + Green mound juniper has dense, compact foliage that stays tidy
- + Evergreen keeps color through winter when kept outdoors
- + Medium size gives more branches to work with than small starters
- - Not suited to indoor life, despite being sold as a houseplant-style gift
- - Confirm the exact height listed for the medium size before ordering
Pelican Rope's tree guy staking anchor and strap kit, 3 pack with 12 ft guy lines and cam lock tensioners.
Fit for the job 7/10 · Features and specs 8/10 · Build and materials 7/10 · Value 7/10
- + Cam lock tensioners make adjusting tension quick and easy
- + 3 pack covers a triangle of guy lines around a tree
- + Straps protect bark better than bare wire guying
- - Intended for garden trees, not small pots on a shelf
- - 12 ft lines are much longer than bonsai trunk guying needs
A tree guying anchor kit with 12ft cable, easy hook anchors, 6 cable clamps and 3 protective tree collars.
Fit for the job 7/10 · Features and specs 8/10 · Build and materials 7/10 · Value 7/10
- + Protective tree collars reduce cable damage to bark
- + 6 cable clamps allow firm, adjustable cable loops
- + Easy hook anchors simplify ground installation
- - Steel cable system is heavy for bonsai-scale guying
- - 12ft of cable limits use to one small in-ground tree
Calibonsai's Yubonzai rectangular ceramic humidity drip tray in black stain for bonsai and indoor plants.
Fit for the job 8/10 · Features and specs 6/10 · Build and materials 8/10 · Value 7/10
- + Black stain finish looks upscale under a ceramic bonsai pot
- + Ceramic construction outlasts plastic trays in daily use
- + Works under houseplants as well as bonsai, so it is versatile
- - Measure your pot base against the tray before ordering
- - Heavier than plastic, making it slower to empty and clean
Brussel's small Satsuki azalea, a gift-ready outdoor flowering bonsai marketed as easy care for newer growers.
Fit for the job 7/10 · Features and specs 6/10 · Build and materials 7/10 · Value 8/10
- + Gift-ready presentation makes it simple to send to someone else
- + Small azalea is inexpensive compared with larger flowering trees
- + Brussel's outdoor stock is a reliable starting point for azaleas
- - Easy care claim is optimistic, since azaleas need specific soil and water
- - No age or height given, so size may be smaller than expected
Brussel's 5 year old green mound juniper, 6-10 inches tall, supplied with a rock pot and matching bonsai tray.
Fit for the job 7/10 · Features and specs 7/10 · Build and materials 7/10 · Value 7/10
- + Rock pot and tray arrive together, so the display looks finished
- + Tray catches runoff and helps keep a patio table or sill clean
- + Mound juniper foliage stays dense and tidy with light trimming
- - Novelty rock pot limits root space if you later want to develop the tree
- - Heavier combined pot and tray is awkward to move for winter shelter
The Tree Guy tree anchor kit, a basic anchoring system for supporting young or newly planted trees.
Fit for the job 6/10 · Features and specs 4/10 · Build and materials 6/10 · Value 6/10
- + Simple kit stabilizes young trees against wind
- + Useful for field-grown bonsai material planted in the ground
- + Straightforward setup without many separate parts
- - Check exactly what stakes and lines are included before ordering
- - Not designed for guying branches on potted bonsai
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Bonsai Nest curates picks for US shoppers. Scores are our editorial assessment. We may earn a commission from links on this page.