Hardiness of Tender Bulbs & Storage

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Happypaphy7

Paphlover
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For those of you who live in hardiness zone 7 and 8, and have grown things like Gladiolus, Dahlias, Amaryllis, Nerine bowdenii, Rain Lily (Zephyranthes candida, also the yellow variety), Tuberous Begonia (odorata but any tuberous type), Calla Lily (colorful hybrids, namely hot pink and dark purple ones) and Pineapple Lily, have you left them outside in the ground and they came back again year after year, or did you have to dig them up every year?
I guess winter rain can be a major threat and snow-covered ground would have the opposite effect.
I have all mine in pots, so that means they would need protection. I read that potted plants should be considered as if their hardiness zone is two above their listed zone. I wonder keeping the pots covered in these brown burlap or plastic bags should be sufficient, or should I just bring them inside, which I'm afraid might be too warm?

So, I have all those listed above, well, except for the Dahlias, which I got rid of midsummer after enjoying some flowers. They attracted way too many little green jumping insects that did quite a bit of damage. They started to spread to other plants near the Dahlias, so I threw away the whole plants.

Everything else except for Cala Lilies and Begonias which are inside now, is still out in the Balcony.
Calla Lilies had their leaves withered down last month and I brought them inside in fear of losing them to cold damage and rot as the weather has been pretty cold often dipping into minus Celsius (below the freezing point). Now I wonder if the room temperature (around 65-70F) is too warm to overwinter them. My biggest worry is that they wake up too soon later as the winter comes to an end.
I have also brought in Begonias last month. They are puzzling me because I was expecting them to be quite tender for some reason, but obviously not really as they have barely lost just a few leaves even after having gone through a few weeks of cold weather nearing the freezing point (nighttime low).
So, they are now sitting inside and very slowly dropping one leaf here and there. Only one out of a few plants detached itself from the tuber. All the rest are still full of leaves and flowers/buds, although they are not really actively growing.
What would you do? Force them to wither down by cutting water completely or keep them going? If I keep them going, would they eventually just wither down and go into dormancy? I was initially expecting that the cold weather would kill off the top growth, then I would bring them inside.

Also, what's your opinion of storing the tuber/bulbs? I like to just leave them in the pot. It worked well for me in the past and I rarely lost bulbs. Some just shriveled away. I mostly keep them bone dry without any water for tubers and for bulbs, I do water every once in a while.
Some people like to take them out of the pot, clean them (I think this can cause damage and introduce diseases potentially), keep them in layers of dry moss, shredded paper inside wooden box or paper bags.
Please share your experience! If you have read it all, that means you are probably also a tuber/bulb enthusiast. Help me out! :)
Thank you!
 
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By the way, while talking about tender bulbs, how it went performance wise in case it interests or helps others in the similar growing conditions as I.
I only get about 2-4 hours of sun during the warmer months. The daytime temperature is rarely over mid 70s even in the middle of summer. The nighttime temperature is almost always much much much cooler.
Gladiolus and Dahlias grew well, but they were leggy due to not enough sun. They bloomed but the flower count was low.
Rain Lilies grew nicely but only produced a few flowers instead of being covered in bloom which easily happens when grown under full fun all day or half day.
Nerine did not bloom this fall, but that was expected as they do not like being moved around.
What worked well for me was Tuberous Begonia (I'm gonna add more next year as they did wonders for me!), Pineapple Lily (this one says full sun, but it did very well for me, so I might add some different varieties too), Calla Lilies, Amaryllis (another sun lover, but it still performed well).
 
I live in an area that was zone 7 for most of my life, but has more recently been updated to zone 8. I've grown many of the plants you've mentioned outdoors year round with no issues. Our summers tend to be hot and dry, with intermittent wet spells, and our winters tend to be quite wet with frequent rain. Snow is typically fleeting and it's rare for it to stick around covering the ground for more than a few days.

Gladiolus, Dahlias, Amaryllis, Calla Lily and Pineapple Lily - I've grown all of these in the ground year round with no issues. I've grown Gladiolus, Dahlias, and Amaryllis (I assume we're talking Hippeastrum) in pots year round. But note that some of these like the "Amaryllis" may have some hybrids/species with different cold tolerances, so you might have to experiment and be willing to sacrifice a bulb or few to test.

Rain Lily - Not sure of the species, but I see these in the woods and other "wild" spaces as well as gardens. I don't know if they are native species or garden escapees. However, my trusted sources are showing they are perennial in zone 7 and up.

Depending on your conditions, it may be enough to place potted plants right up next to the foundation of the house or building if that's feasible. If that's not an option, you may leave them in their pots, place them down into a cardboard box, and fill around them with leaves or torn up newspaper. I've done that with Hippeastrums before I was certain they were cold hardy. Basically just let them dry out first, and then didn't bother to water them over the winter.
 
Thank you for the reply!
Yes, by Amaryllis I meant Hippeastrum. I think I might bring them in because they are the most expensive to replace. Others are much cheaper that I could just treat them as annuals if I wanted to. but then things like Rain Lily and Nerine bloom much better 2-3 years after being left undisturbed in the same spot so I'd love to be able to have them around long term rather than having to replace them every year.
Especially the Nerines as they rarely bloom in the same year they are planted.

So cardboard box is actually an idea I've never thought about! I have already bought a bunch of those winter protection sheets made of synthetics when they were available back in October. They were cheap, too, so I just grabbed a whole bunch just in case. Maybe try them as space filler for added protection.
Or try some of the cheaper plants in doube or triple layered plastic bags/bubble sheets.
 
My outdoor garden in Zone 8b (Seattle area) and I would second the “box with insulating materials stuffing around it” idea. Ive lost some expensive tender bulbs to slightly below freezing temps when I just left the pots sitting up against the foundation…also by trying to use an outdoor heat bulb over the pots…AND also by letting them get waterlogged during our copious winter rains. Good luck!!
 
My outdoor garden in Zone 8b (Seattle area) and I would second the “box with insulating materials stuffing around it” idea. Ive lost some expensive tender bulbs to slightly below freezing temps when I just left the pots sitting up against the foundation…also by trying to use an outdoor heat bulb over the pots…AND also by letting them get waterlogged during our copious winter rains. Good luck!!
Thank you for your input!
Yeah, the American Westcoast and the winter rain...but I quite like the light drizzling rain in the summer afternoon in Seatltle! :)
I have a deck over my balcony so as long as the plants are brought closer to the wall, I don't have to worry about winter rain and sleet.
 
That sounds good! Dry is definitely better than soggy! For what it is worth, I do think the larger the pot, the better the dormant bulbs overwinter, too.
I want to eventually try larger pots for certain plants. I mean larger volume typically means better show of plants and flowers anyway, but for now, I'm starting with more varieties in smaller quantities as I'm in trial phase so to speak and test things out here.
Unfortunately, my storage room at the basement is too close to the heat source and stays way too warm. My initial plan was to store most of the tender bulbs/tubers down in the cellar, but that's no longer an option. Plus, in case rodents ever get to my plants and eat them as winter snack, I wouldn't be too happy 🤣
I hope to have a nice sunny outdoor space soon whether it is in the form of a garden or a larger sunnier balcony. Time will tell. :)
 
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