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What's Wrong With My Boxwood?

Down The Garden Path Podcast

Release Date: 05/28/2025

Houseplant Chat: Fertilizer show art Houseplant Chat: Fertilizer

Down The Garden Path Podcast

In the fourth episode of Down the Garden Path's "Houseplant Chat” series, Joanne discusses the basics of fertilizing houseplants. Topics Covered When to start fertilizing Wait until days are noticeably longer (sometime after daylight savings time) when plants begin active growth again. How to read fertilizer labels (N-P-K) The three numbers represent Nitrogen (N), Phosphorus (P), Potassium (K). Leafy plants may benefit from higher nitrogen; flowering plants often need more phosphorus. Choosing an “all-purpose” fertilizer Balanced blends (e.g., 10-10-10) can work for many...

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Houseplant Chat: Propagation Made Simple show art Houseplant Chat: Propagation Made Simple

Down The Garden Path Podcast

In the third episode of Down the Garden Path's "Houseplant Chat” series, Joanne discusses propagation, a simple and rewarding way to expand your plant collection. Topics discussed: Quick recap of and : winter light, soil refresh/repotting, and watering What propagation is (and why it’s easier than starting from seed) Best beginner-friendly plants to propagate: pothos and philodendrons Fixing a long, “leggy” trailing plant by trimming and replanting rooted cuttings back into the base to fill it out How to take cuttings: clean tools, cut around leaf nodes, and root in water How long...

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Houseplant Chat: Soil & Watering Tips show art Houseplant Chat: Soil & Watering Tips

Down The Garden Path Podcast

In the second episode of Down the Garden Path's "Houseplant Chat” series, Joanne focuses on soil and watering techniques during the winter months. Topics discussed: Joanne emphasizes the vital role that soil plays in the health of our houseplants. Steer clear of potting soils with added fertilizers or unnecessary ingredients, as houseplants generally do not require fertilization during this period. Instead, opt for a basic, nutrient-rich potting mix that supports healthy growth without overwhelming your plants. For those with existing plants, it's essential to check if they need repotting....

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Houseplant Chat: Getting the Light Right show art Houseplant Chat: Getting the Light Right

Down The Garden Path Podcast

This week, Joanne kicks off the 12th season of the Down the Garden Path podcast with the first episode in her “Houseplant Chat” series: Getting the Light Right. Tune in to learn how to keep your houseplants happy when winter light disappears. Topics discussed: Joanne emphasizes the importance of light for houseplants, especially in January, and shares practical tips for ensuring plants receive adequate light. She discusses her personal experiences with moving plants around her home to optimize their light exposure and highlights specific plants that thrive in low-light conditions, such as...

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Canada Gardener's Journal with Steven Biggs show art Canada Gardener's Journal with Steven Biggs

Down The Garden Path Podcast

This week, Joanne welcomes horticulturist Stephen Biggs back to the podcast to talk about his latest project, the newly expanded About Steven   Steven was recognized by Garden Making magazine as one of the “green gang” making a difference in Canadian horticulture. His home-garden experiments span driveway straw-bale gardens, a rooftop kitchen garden, fruit plantings, and an edible-themed front yard. He’s a horticulturist, award-winning broadcaster and author, and former horticulture instructor with George Brown and Durham Colleges in Ontario, Canada. His other books...

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Soil Testing with Amy Ellard-Gray show art Soil Testing with Amy Ellard-Gray

Down The Garden Path Podcast

This week on the podcast, Joanne discusses soil testing with The Hobby Homestead's Amy Ellard-Gray, who grows 75% of her family’s fruits and vegetables in her Guelph backyard.  About Amy Amy runs The Hobby Homestead in suburban Guelph, where she cultivates over 100 varieties of native plants to support the local ecosystem. Through her , , , and in-person consultations, she helps people design and troubleshoot their own food-growing spaces. Her mantra, “growing food in harmony with nature,” guides everything she does, from tending soil life to welcoming wildlife into the garden....

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Transitioning to Indoor Gardening show art Transitioning to Indoor Gardening

Down The Garden Path Podcast

This week on Down the Garden Path, Joanne shares her passion for indoor gardening with practical winter houseplant care tips and a reminder that there’s always something new to learn and grow. Topics discussed: 1. From Annuals to Houseplants It's time to turn your attention to houseplants as gardening shifts indoors. Don't rush out to buy new plants: friends and family often have extras or cuttings to share. 2. Winter Care Basics During shorter days and lower light levels, houseplants slow down their growth. Do not fertilize in winter; they’re not actively growing. Keep watering...

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Mythic Plants with Ellen Zachos show art Mythic Plants with Ellen Zachos

Down The Garden Path Podcast

This week, Joanne welcomes Ellen Zachos, author of 11 books on plants, including her latest, . About Ellen A Harvard graduate, Ellen's first career was on Broadway (Les Miz), but the gift of a peace lily on opening night opened her eyes to the wonderful world of plants. Ellen taught at the New York Botanical Garden for many years and also served as Coordinator of the Gardening Department in Continuing Ed, before moving to Santa Fe, NM. She was named a Great American Gardener by the Epcot Flower and Garden Festival. Her 11th book, , was published this year. Inspiration & Research ...

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The Suburban Gardenista show art The Suburban Gardenista

Down The Garden Path Podcast

This week on the podcast, Joanne welcomes Brandie, the Suburban Gardenista, an avid gardener passionate about supporting pollinators with native plants. Brandie is Pollinator Stewardship Certified by Pollinator Partnership Canada and loves sharing her learnings through podcasts, workshops, and social media.  You can find her online on  and @thesuburbangardenista. Brandie’s Gardening Journey Began gardening ~20 years ago after moving into a home with no plants Inspired by her mother’s lush gardens Discovered native plants through growing Obedient Plant — her “gateway”...

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How to Overwinter Your Annuals show art How to Overwinter Your Annuals

Down The Garden Path Podcast

If your summer containers still look surprisingly lush, don't toss them out just yet. This week on the podcast, Joanne discusses how, with a little care, you can enjoy them again next year. Tune in to learn how to overwinter your annuals. Topics discussed: Many annuals are still looking great in mid-October — don’t toss them yet! You can successfully overwinter several annuals to save money and enjoy them again next year. There’s no single foolproof method; success depends on the type of plant, growing conditions, and care. Joanne shares three main methods: bringing the whole plant...

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More Episodes

This week on Down the Garden Path, Joanne discusses strategies to prevent a box tree moth infestation and explores the moth’s continued impact on boxwoods in Durham Region.

Here are some of the topics discussed in this episode:

  • The impact of the box tree moth on boxwoods
  • Its discovery in Ontario in 2018 and its recent appearance in Durham Region
  • Box Tree Moth Life Cycle: The adult moth has a short lifespan of 14 days but is a strong flyer, making it challenging to control
  • The challenges in controlling the pest are due to its rapid reproduction and ability to survive cold winters
  • Presents a significant threat to boxwoods and may be here to stay
  • Be aware of its presence and consider protective measures for your plants
  • Inspect boxwood plants for signs of box tree moth infestation, including webbing, chewed leaves, and caterpillars
  • Explore treatment options, focusing on the need to kill caterpillars at the appropriate stage
  • The only current control method is biological, using BTK spray, which must be applied diligently from mid-May onwards, ensuring thorough coverage, including the undersides of leaves
  • Avoid moving boxwood plants to new locations to prevent spreading the box tree moth
  • Explore alternative plants such as yews, globe cedars, strongbox holly, Japanese pieris, dwarf hydrangeas, dwarf mock orange, or dwarf lilacs as replacements for boxwood.
  • Focus on ornamental areas rather than hedges when replacing boxwoods

Find more information about the box tree moth:

Canadian Food Inspection Agency

Landscape Ontario

The Box Tree Moth in Southern Ontario

What’s Wrong with Your Boxwood?

Have a topic you'd like Joanne to discuss?

Email your questions and comments to downthegardenpathpodcast@hotmail.com, or connect via her website at down2earth.ca.

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Find Down the Garden Path on Instagram, Facebook, and YouTube: @downthegardenpathpodcast.


Down the Garden Path Podcast

On Down The Garden Path, professional landscape designer Joanne Shaw discusses down-to-earth tips and advice for your plants, gardens and landscapes. As the owner of Down2Earth Landscape Design, Joanne Shaw has been designing beautiful gardens for homeowners east of Toronto for over a decade. She does her best to bring you interesting, relevant and useful topics to help you keep your garden as low-maintenance as possible. 

In Down the Garden Path: A Step-By-Step Guide to Your Ontario Garden, Joanne and fellow landscape designer Matthew Dressing distill their horticultural and design expertise and their combined experiences in helping others create and maintain thriving gardens into one easy-to-read monthly reference guide. Get your copy today on Amazon.

Don't forget to check out Down the Garden Path on your favourite podcast app and subscribe! You can now catch the podcast on YouTube.