Episode 236: three houseplants for cold rooms
Transcript
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Turning your thermostat down this winter? Here are three plants that will thrive in unheated rooms. Plus I answer a question about root pruning.
Check the show notes as you listen…
A botanical illustraion of African hemp taken from the book Traité des arbres et arbustes que l'on cultive en France en pleine terre. Photograph: Rawpixel Ltd on Flickr.
Winter cherry - Solanum pseudocapsicum
This plant has several common names, including Jerusalem cherry and Madeira cherry, but it actually grows wild in South America, including Bolivia, Uruguay and Brazil.
This is a member of the Solanaceae or nightshade family, along with familiar food plants including chillies, tomatoes and potatoes.
Although its fruit looks like a chilli or a cherry tomato, this is a toxic plant, so do not consume it or let children or pets nibble.
This species will be fine down to around 10C (50F) indoors: give it bright light and moist air and avoid placing in centrally heated rooms.
Winter cherry pops up at plant sellers in autumn, ready for the festive season.
It can grow outside in sheltered spots in temperate climates, is naturalised in some countries, and has become invasive in some places including Australia.
It has been in cultivation for a really long time, and there are numerous cultivars and incorrect scientific names - you may see it sold as Solanum capsicastrum.
Winter cherry is often sold as a temporary ‘pot plant’ but could be put in the garden once the risk of frost has passed in spring to spend the warmer months outside.
African hemp - Sparmannia Africana
Sparmannia africana is part of the mallow family. Photograph: Liesbeth de Toom on Flickr.
Also known as house lime as it resembles the lime tree, Tilia cordata, and they are both members of the mallow family (Malvaceae).
This plant gets tall - 6ft or more - but can easily be hacked back, ideally in spring. Place it outside in summer if you can.
Sparmannia can tolerate temperatures down to 7C (45F) but needs really good light: it was a popular plant in large country homes of the past.
It comes from southern Africa.
Despite the common name, it is not closely related to Cannabis sativa.
Keep the soil evenly moist when in active growth, but allow it to dry out a little more over winter as light levels drop.
The stamens will puff out when the flower is touched, which is meant to aid pollination: this is known as thigmonasty.
If you are in the UK, Jungle Seeds sell the seeds of this species, and plants pop up periodically in specialist plant shops.
False castor oil plant - Fatsia japonica
A member of the Aralia family, which grows wild in Japan and Korea, just like another cold-tolerant tough houseplant, Aspidistra elatior.
10C (50F) (probably lower provided it doesn’t frezze hard) needs high humidity and bright light.
Dizygotheca elagantissima/Aralia elegantissima with finely cut leaves.
x Ftashedera lizei
‘Moseri’ is a more compact cultivar, ideal for pots; ‘Variegata’ and ‘Spider’s Web’ are two of the variegated cultivars of this species.
A rootbound plant will benefit from root pruning. Photograph: Jane Perrone.
QUESTION OF THE WEEK
Stephanie got in touch to ask about root pruning a plant that needs a refresh, but has to stay in the same sized pot. The best time to root prune is when the plant is in active growth, especially in spring.
Don’t be afraid to slice away areas of compacted roots, particularly at the bottom of the rootball: you can use a serrated knife or a kitchen knife. Remove any roots that are rotted, and tease the roots out where they are matted so they point outwards.
Knock off or wash away as much of the old substrate as possible, and replace with new. Make sure the rootball is well watered so that the plant can start to reestablish and does not experience drought stress.
Want to ask me a question? Email ontheledgepodcast@gmail.com. The more information you can include, the better - pictures of your plant, details of your location and how long you have had the plant are always useful to help solve your issue
THIS WEEK’S SPONSORS
KINDER WORLD
Kinder World is the free mobile game about houseplants, healing and practicing kindness. From decorating your own cozy space to caring for house plants and choosing delightful artisanal pots for them, Kinder World is your safe zone. Kinder World’s design philosophy is simple but powerful: helping people heal from the stresses of everyday life by being part of a kind community. Kinder World has a full time wellbeing researcher on board to make sure the game’s goals are all grounded in science. Kinder World is available to download for free on the Apple App Store or Google Play - find out more at playkinderworld.com.
TRUE LEAF MARKET
Thanks to True Leaf Market for sponsoring this week’s show. Download their free cover crop guide here. Get 15% off cover crop seeds at trueleafmarket.com with promo code OTL15. This discount is only available for cover crop seed products. Offer expires end of December 2022. Limit one use per customer.
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CREDITS
This week's show featured the tracks Roll Jordan Roll by the Joy Drops, The Road We Use To Travel When We Were Kids by Komiku and Sundown by Josh Woodward. The ad music was Whistling Rufus by the Heftone Banjo Orchestra and And Never Come Back by Soft and Furious.