Help! How to Overwinter these Non- Hardy Plants, Tubers, Bulbs?

arbo_retum(z5 ,WinchstrMA)November 15, 2012

After a few years of container growing non hardy plants, I have finally organized my huge question of how to winter store the plants I cannot leave outside in my z.5 garden. PLEASE let me know anything

you can! and thx so much



1)-- Leave in situ planted in Glazed Pots, on Risers or pedestals (covered w/ plastic shrub covers)

2)--Open Screen Porch

3)- Bury Plastic Pots in Ground Trench

4)--Shed w/ small skylight, under Mature Hemlock

5)- Tiny Cellar 60 degrees , no windows

6)- Steps under Hurricane Door leading to Cellar Door

7)- South Facing House Plant Room, wall of windows, skylights; open to living room, 65-70 degrees;filled w/ pots of Amaryllis, Xmas Cactus, Queen's Tears, Ferns , so window space is precious



(And Do They Need Water; how often?):

Pilea- Aluminum plant

Breynia- Snowbush

Pennesetum Villosum

Oxalis Cabernet

Dahlia ( can I leave planted in glazed pots and store in cellar?)

Taro ( can I leave planted in glazed pots? cellar or plant room? )

Colacasia ( """""" )

Alocasia ( """" )

Clematis w/ tulips, allium, in glazed pots

Cissus Discolor

Begonia Rex (leave in soil in pots and let dry and go dormant in cellar?)

Tuberous Begonia (leave in soil in pots in cellar, let go dormant?)

Glazed or Plastic Pots Planted With Tulips,Hyacinthoides and Allium

Glazed or Plastic Pots Planted With Lilies , Allium, Tulips



Brugmansias -are left planted in glazed pots, in cellar

Cannas -are left planted in plastic pots in cellar

Abutilon - are transplanted into plastic pots in plant room

Ppl Wandering Jew- transplanted into plastic pots, in Plant Room


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I'm not sure how much help I can be, but I'll give it a shot...

First of all, there is no one-size-fits-all watering schedule a grower can keep when it comes to containerized plants. Each plant will use water, and water will evaporate, at a different rates... based upon plant type, size, pot size, location, medium used, weather, humidity, etc...

So, any potted plant should only be watered when it needs to be watered. I use a combination of my finger/sense of touch, and the wooden skewer method, to determine the moisture content within each pot. Even when soil feels dry to the touch near the surface, there could be plenty of moisture deeper within the pot, hence insertion of a wooden skewer to test for moisture, and a rather dry feeling medium may even contain moisture molecules at a small percentage that we can't feel with our own sense of touch.

The Tulips, Lilies, Allium, and Hyacinthoides can be kept potted, and the pots buried up the rim in a garden, then mulched for the winter... as long as they're buried at their recommended depth, those types of bulbs are hardy to northern climes. However, squirrels and other rodents love to feast on them, so once the pots are buried, you may want to lay some screen over them before mulching... then remember to remove it early enough so the new shoots can get through.

Some of the other plant types you mention are not hardy to your zone 5, and will require being kept in relative warmth. I don't think covering anything that sits up on a pedestal will do much good, as windchills can be quite devastating to plant roots that don't have the protection of being at ground level or buried, and protected with mulch of some kind.

Hopefully, someone with more knowledge of your various plant types will be along to help...

I'm in zone 5b, and bring all my tender potted plants indoors for winter, and try to place them where they will get the most light, treating them more as houseplants that are just resting for winter.

Anything hardy to my zone either gets planted and mulched, or goes into an unheated, and otherwise unused, garage building once dormant. I group my potted perennials and shrubs together in plastic baby pools inside the garage, and I close up the building until early spring. I will check occasionally to see if the soil is dry, and if so, I will spread a few shovels full of snow over them to simulate nature and its winter moisture source. When dormancy breaks in spring, I begin opening the east facing garage doors to let in light, and as soon as I feel the weather is stable enough, I bring everything back outside for another growing season.

I don't know how much I've helped you, but I wish you luck. :-)

    Bookmark   November 16, 2012 at 12:43PM
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Jodik, well put and I follow your good advice. Seems to work for me as always! Thank you and it's good to see you!

Good luck Arbo.

    Bookmark   November 16, 2012 at 5:38PM
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Thanks, Mike. :-)

I'm not an expert, but I do have several decades of growing, both indoors and out, under my belt... and I've learned a thing or two along the way. Some of those things are... no two growers will have the exact same environment to deal with, so it's very helpful to learn the basic science and physics of plant and root growth... there are vast differences between growing in the ground and growing in pots... and keep in mind that the gardening industry is in business to make profit and therefore caters more to an idea that one-size-does-fit-all, and that's how they supply the entire nation, product wise, in general. We know this isn't true, so we have to learn and adjust.

The world of gardening is filled with myth, misinformation, old wives' tales, and fallacy. The best course of action is to learn the basic facts of science and physics when it comes to plant growing... knowledge is power.

There is no such thing as a "green thumb"... it's all applied knowledge.

Happy Growing!

    Bookmark   November 17, 2012 at 5:02AM
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Mindy: At this point I think you could agree that it would be easier to contact some of the Mass hort members that you may already know for your questions.

    Bookmark   November 27, 2012 at 1:21AM
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