Saturday, June 10, 2023

GardenDC Podcast Episode 151: Clematis

In this episode of GardenDC: The Podcast about Mid-Atlantic Gardening, we talk all about Clematis with Jeff Jabco, Director of Grounds and Coordinator of Horticulture at Swarthmore College and the Scott Arboretum. The plant profile is on Penstemon and we share what's going on in the garden as well as some upcoming local gardening events in the What's New segment. We close out Dr. Allan Armitage*, who returns to share the Last Word on heat in the garden.


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*Dr. Allan Armitage is also offering a discount for free domestic shipping when ordering his books through June 2024 at allanarmitage.net, simply enter the code LASTWORD at checkout.

Show Notes:

01:26 Meet Jeff Jabco 02:13 Jabco grew up in a small town with the influence of gardening around him, allowing him to foster his fascination for plants. 03:25 Jabco got his first horticulture job at a local landscape nursery at 14 years old where he learn he was interested in both the artistic and scientific side of plants. 05:25 Jabco majored in horticulture with an emphasis on plant breeding and minored in landscape architecture. 07:53 Jabco still grows fruit crops along his property, including brambles, blueberries, cranberries, and figs in a “cool Zone 7.” 10:25 Swarthmore College/Scott Arboretum is open to the public, allowing visitors to see the gardening and landscaping across campus. 14:30 How to pronounce Clematis? 15:45 Where are Clematis native to? 18:31 How tall can Clematis (Viorna) get? 19:08 The hardiness of different varieties of Clematis in different zones, and how they react 22:50 Find information about Clematis online at https://www.clematisontheweb.org/new-... to learn more about your specific variety. 24:44 How, when and where to prune your Clematis - don’t be afraid, and pay attention to how it reacts. 27:48 Gardeners prune their Clematis to optimize the amount of blooms in a garden setting, and to keep them at a manageable size. 28:56 Mother's Day syndrome: Why there are so many garden blooms in May. 30:24 How to prune the May-blooming Clematis, what happens to them, and what would happen if you didn’t 32:23 If you deadhead and cut back shoots by 6 to 12 inches of the large-flowered May-blooming Clematis after they’ve finished flowering, they may give you a second round of flowers in the summer. 34:03 Which type of Clematis to give to new gardeners, or which to start with as a new gardener? 35:52 What if you didn’t prune your Clematis? 37:27 'Sweet Autumn' Clematis takeover - a highly invasive plant. 39:37 Growing Clematis companions: How do they grow and what should they be grown next to? 43:40 How to help your Clematis grow higher if it can’t stick onto the surrounding materials. 44:01 "The ‘Polish Spirit’ is probably my go-to plant for a novice gardener.” 46:35 Rebar, branch scraps, and wire: What to use to build your own garden post. 48:56 What to ask your local hardware store to get started on your own DIY garden post. 49:40 Clematis 'Venosa violacea’ is a staple for Jabco as an easy-to-grow Clematis with a “glowing” appearance. 50:47 While Clematis ‘Roguchi’ requires support, it makes a beautiful cut flower and can grow high with sufficient support. 52:45 Some of Jabco’s favorite wide-open Clematis include long-bloomer ‘Jackmanii’, ‘Hagley Hybrid’, ‘Guernsey Cream’, ‘The President’, ‘Warszawska Nike’, and much more. 54:42 The ‘Dutch Sky’ Clematis came out on top of Jabco’s “Clematis trial” in 2014. 57:52 Where to find recommended Clematis www.clematisinternational.com 58:56 While the ‘Taiga’ variety is a beautiful and smaller variety of Clematis, it does have slightly more restrictions than its counterparts. 1:01:34 Fertilizing Clematis: Provide even moisture for the plants and decent drainage with good quality dirt, compost, and a slow-releasing fertilizer with a lower Nitrogen count in order to promote reflowering. 1:05:26 Penstemon: This week's Plant Profile! 1:07:38 Garden updates: Hydrangeas and Spirea are blooming, garlic and blackberries are ready for harvesting, and peas and lettuce are finishing up for the season. 1:08:16 Dr. Allan Armitage offers a discount of free domestic shipping 1:08:38 Upcoming Events: Talk to the Silver Spring Garden Club; Under the Arbor - Tussies Mussies - A Bouquet with a Message; Washington Gardener Photo Show. 1:10:30 Groundcover Revolution 1:11:53 The Urban Garden 1:12:52 The Last Word on heat in the garden by Dr. Allan Armitage. 1:13:31 What's the best medicine for the summer heat? Keep your plants strong in the spring 1:14:01 "Daytime temperatures are not the issue … as far as the health of the plant is concerned, when it gets hot and stays hot at night, plants respire."

Clematis Links:
Clematis on the Web: https://clematisontheweb.org/
International Clematis Society: https://www.clematisinternational.com/

Clematis Sources:
Brushwood Nursery     www.brushwoodnursery.com
Hummingbird Farm      hummingbirdfarm.net
Springhill Nursery     springhillnursery.com

If you liked this episode, you may also enjoy listening to:
~ GardenDC Podcast Episode 98: Native Vines

This episode is archived at: 

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Episode Credits:
Host and Producer: Kathy Jentz
Interview Editor and Show Notes: Marissa Yelenik

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