All Of It: How to Appreciate Your Houseplants this Winter – January 10, 2025

In the January 10, 2025 episode of WNYC's All Of It, host Alison Stewart delves into the art of winter houseplant care with expert guest Chris Satch, renowned as the Plant Doctor. Celebrating National Houseplant Appreciation Day, the episode offers listeners a wealth of insights into keeping indoor plants healthy and thriving during the colder months. Through a series of listener questions, Chris addresses a variety of plant care challenges, providing practical advice and professional tips.

Winter Houseplant Care Essentials

The episode kicks off with Alison Stewart introducing Chris Satch, a professor at the New York Botanical Gardens and the founder of NYC Plant Help. She sets the stage by emphasizing the importance of giving houseplants extra attention in winter, noting, “In the dead of winter, houseplants can use all the love they can get” ([00:37]).

Chris Satch discusses how plants respond to the shorter days and decreased sunlight during winter. “Plants have various proteins inside of them that sense red light and determine the length of the day,” he explains ([02:07]). This sensing mechanism triggers reactions that influence their growth and maintenance needs.

Listener Questions and Expert Advice

The heart of the episode revolves around listener calls, each presenting unique plant care dilemmas:

1. Repotting Phalaenopsis Orchids ([05:02])

Caller Karen from Manhattan seeks advice on repotting her phalaenopsis orchids, noticing that many roots are exposed. Chris advises, “Repot into a nice orchid bark mix… Just replant into that and water once or twice a week.” He emphasizes the importance of using a well-drained medium tailored to epiphytic orchids.

2. Giant Umbrella Plant Dropping Leaves ([06:24])

A listener reports her giant umbrella plant drying up and losing leaves despite unchanged care routines. Chris attributes this to seasonal changes, suggesting that adjustments in care are necessary as light and temperature fluctuate during winter.

3. Caring for a Venus Fly Trap ([11:17])

Caller David from the Upper West Side shares his struggles with a Venus fly trap that appears to be dying. Chris clarifies that overfeeding can be detrimental, stating, “Feed it once a month… you might be overfeeding it.” He recommends using distilled water and ensuring the plant isn’t exposed to minerals that could cause leaf discoloration.

4. Succulent Potting Soil ([13:00])

A listener inquires about the difference between regular potting soil and succulent-specific mixes. Chris reassures, “You can take regular potting soil and plant your succulents in there,” noting that adding sand can enhance drainage but isn't strictly necessary. He encourages flexibility, highlighting that succulents are generally forgiving.

5. Polka Dot Begonia Health ([13:40])

Anya from Carol Gardens reports her polka dot begonia exhibiting brown, dropping leaves. Chris suggests checking for cold drafts and ensuring adequate light, as begonias thrive in warm, well-lit environments. “Make sure you’re giving it as much light as you can,” he advises.

6. Water Quality and Fertilization ([15:31])

Frank from Montclair questions the necessity of using filtered water versus tap water and the effectiveness of over-the-counter plant foods. Chris defends tap water quality, especially in New York City, and explains the role of fertilizers as plant vitamins rather than essential foods. He recommends balanced fertilizers like Dynagro for added calcium.

7. Pruning and Propagation Techniques ([20:47])

Listeners seeking guidance on pruning and propagating various plant types receive Chris’s expertise. He explains that the growth direction of a plant influences pruning strategies, and shares methods for propagating both tree-like and shambler plants. “You can trim just about anywhere and force it to grow in any way you like,” he notes.

8. Dracaena Propagation ([22:16])

Jamie from the Upper West Side asks about propagating a dracaena tree that shows nascent roots after being placed in water. Chris acknowledges the natural propagation methods of tropical plants and advises maintaining clean water to prevent mold, ensuring that roots develop fully before transferring to soil.

9. Gardenia Overwintering ([26:33])

Angela from Mendham seeks tips on keeping her gardenia plant healthy through winter. Chris emphasizes the plant's need for ample sunlight and suggests investing in high-quality plant lights to mimic the intense light gardenias require. “They prefer it on the hot side… blast it with as much sunlight as you physically possibly can,” he advises.

10. Pony Palm Pest Infestation ([28:49])

Sharon from Piscataway describes her pony palm being afflicted with a white powdery substance and leaf loss. Chris identifies the issue as a mealybug infestation and recommends using insecticidal soap, escalating to systemic pesticides if necessary. “Just keep spraying and wiping them off until they all go away,” he instructs.

11. Thrips on a Bonsai Tree ([31:39])

Kevin from Brooklyn reports tiny bugs damaging his bonsai tree's branches. Chris identifies the pests as thrips, explaining their destructive feeding habits. He recommends spraying with insecticidal soap and, if needed, introducing predatory mites to control the infestation.

Community and Continued Learning

Towards the end of the episode, Chris highlights the vibrant community of plant enthusiasts in New York City. He encourages listeners to join local plant clubs, such as the Manhattan Orchid Society or the Cactus and Succulent Society, to share knowledge and resources. “These clubs have meetings at least once a month… and I’m a part of almost all of them,” he shares, underscoring the value of community in fostering plant care expertise.

Final Thoughts

Alison Stewart wraps up the episode by reiterating the importance of attentive plant care during winter and celebrating the joy that houseplants bring to indoor spaces. The episode not only provides actionable advice for plant owners but also fosters a sense of community among culture and plant enthusiasts alike.

Notable Quotes:

• Chris Satch on Plant Sensing: “Plants have various proteins inside of them that sense red light and determine the length of the day” ([02:07]).

• On Repotting Orchids: “Repot into a nice orchid bark mix… Just replant into that and water once or twice a week” ([05:17]).

• On Fertilizers: “Fertilizers are salts. So you want a very well balanced fertilizer for most of your things” ([15:07]).

• On Thrips Identification: “Thrips… they slash into the cells” ([33:12]).

This episode of All Of It serves as a comprehensive guide for houseplant enthusiasts navigating the challenges of winter care, blending expert knowledge with community-driven questions to cultivate a flourishing indoor garden.