Allow me to play devil's advocate for you: * The plants inside a 6x6x6 gh will likely be too tight/dense. Not only will this prevent heat from your heater reaching all the leaves -- making them prone to cold damage through the plastic -- but the leaves closer to the heater may very well burn. * In "tornado alley," a gh such as the one you linked may end up in the next county. Even if you staked it down with rebar, the structure itself is too flimsy to withstand forces twisting it any direction but downwards. * I ran the calcuations for a gh your size, as well as the proposed covering. In order to maintain an inside temp of 55F when the outside dips to 20F, requires 6,486 BTUs. An electric heater maxes out at 5,120. Be advised that if you must run your heater on an extension cord (likely in a backyard), you will only get close to that output if you use a 12-gauge extension cord. Not only would it not be safe, but a "standard" 16-gauge cord, for example, would reduce your BTUs by at least 25%. If you are reasonably handy, you could build a very sturdy, suitable structure, larger, and double-insulated, for maybe $200 more than your 6x6...using UV-resistant gh fabric. BTW, your greatest difficulty will probably be keeping your plants from cooking in the sun, and not suitably warm when it's cold. Not trying to beat your project down -- just want you to be successful and not disappointed! -Bruce

Another idea that isn't big leaved - I like to soften using Gypsophila (Baby's Breath). The G. repens (quite pink) has been blooming for a while, and will continue for while yet. They love the full sun, hot conditions - I have several at the front of the house (south facing). The other Baby's Breath I really, really love is one called Rosy Veil. You can't grow it from seed - it's a cross between G. repens and paniculata. It grows more wide than tall, unlike paniculata. When in bloom they look like clouds in the garden, but you need plenty of space for them as they can easily reach 3' across but only about 18" in height. Again, they love the hot, sunny and dry and are long lived in the right conditions. Finally, Limonium latifolium (Sea Lavender) might work as well. Although the leaves aren't big and round, they also aren't jagged or spikey (maybe a little pointy, but not spikey). They also produce airy clouds of bloom later in the summer - the foliage stays low but the blooms are held up high so it might be taller than what you're looking for.

No matter what, Tanya, in the hosta market, today--it's a risk when you buy one. Don't worry about it--if it's HVX you will know in a few years, for pretty sure. Just make sure not to cut scapes with the same knife or scissors you just cut another with. And, if you dig and divide, make sure you also clean the shovel and or knife (after and between digs) with a fury, with Dawn dish detergent and a bleach solution. With the nematodes--in my opinion, it's a worse problem. But--what are we going to do--give up our passion? Nope, we'll just have to 'deal with it'!!! Enjoy what you've done!!! I've gone through the hysteria of nematodes and the frustration of HVX--and I think I'm beginning to mellow. The nematodes I found the other day--didn't get 'nuked' this time, like the leaf I showed above (my first discovery on a newly purchased 'Sugar and Cream'). In fact, I'm so cool about it--it's still in that card-board box up on the deck! I feel sorry for it!! But--not for the 'nems'!!! I hate that they are such a problem--and my graphic is from the previous experiences, but I just posted it for fun this time!! I'm not nearly as 'freaked' as before--but still miffed at the seller for selling it--because it was a problem she saw--and felt she had to conceal, whether she understood what it was or not! That, to me, shows a lack of integrity--which I value very much in anyone, whether they are selling me something or just being a friend--be honest, sincere, kindly forthright and patient with me--cause we all are 'a work in progress' on some level! :o/ Did I mention I just can't abide someone who 'flatters' which translates to be someone being very ingenuous--hoping to impress me and with an ulterior motive--that I always wonder about!!! And, I just don't understand the desire to hurt another person, to put them down or make them feel idiotic--what is with that in a person to feed off that kind of hurtful mindset?? Oh well--now you know more about me than you ever wanted to know--right? LOL

Yellow leaves can be overwatering. Make sure soil is consistently moist but not wet. Check with fingers. Consistent watering is key, as is the soil. If it is not draining enough, water less but more often or provide m Yellow leaves can be overwatering. Make sure soil is consistently moist but not wet. Check with fingers. Consistent watering is key, as is the soil. If it is not draining enough, water less but more often or provide more drainage. Usually soil is the issue, you can't over water a plant if it has very draining soil. Try adding pumice, charcoal, leaves, twigs and bark to get better drainage. Perlite can be used but it can come to the surface over time so some people prefer pumice. Be aware that extra organic matter like bark takes nitrogen out of the soil as it breaks down so fertilise occasionally. Tropical plants like air flow to roots. So drainage is essential for air to not compact the soil. ore drainage. Usually soil is the issue, you can't over water a plant if it has very draining soil. Try adding pumice, charcoal, leaves, twigs and bark to get better drainage. Perlite can be used but it can come to the surface over time so some people prefer pumice. Be aware that extra organic matter like bark takes nitrogen out of the soil as it breaks down so fertilise occasionally. Tropical plants like air flow to roots. So drainage is essential for air to not compact the soil.