Can I use Miracle Grow in begonia bulbs that are just showing small green growth? They were planted five days ago.
If the begonia corms (that's what they're called rather than bulbs,) were planted in fresh soil, you can hold off fertilizing for 2 or 3 months, then go ahead and use dilute fertilizer -- 1/4 strength package directions. If the soil was not fresh, you can use dilute fertilizer now. Fertilize once a month to every week, depending on the amount of light (more light, more fertilizer.) Here's an article that will tell you more about growing begonias from corms: https://www.gardeningknowhow.com/ornamental/flowers/begonia/growing-begonias-from-corms.htm
In her article (Shari Armstrong) on solutions for powdery mildew, for non-toxic remedies a dilution of hydrogen peroxide and potassium salts, what proportions do you recommend for the peroxide (and water, I assume)? What are potassium salts, how might I acquire it, and how is it used? My particular interest is currently an indoor begonia.
You can avoid all the worry about mixing amounts and where to get certain items. You can buy a product call Green Cure that will do the trick and has all the items already in it, it is an Earth Friendly product and I can personally testify that it works great! Here is a link where it can be purchased: http://www.planetnatural.com/product/green-cure-fungicide/
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Stan The Rose Man
Consulting Rosarian
Gardening Know How
I live in SC and kept my begoina plants indoors during the winter; they were beautiful. I put them outside a few days ago, as the weather was warm. The next day all the leaves had turned white and almost translucent. Will they come back? What do I need to do to preserve them? Thank you for your help.
If you did not acclimate it before moving it outside, it may be suffering a bit from shock. This is ok and it should recover. Lots of times this is a huge factor that contributes to the failing health of plants. They get stressed and as a result, fail to thrive. For future reference, here is an article or two that you may find helpful: https://www.gardeningknowhow.com/houseplants/hpgen/acclimating-houseplants-outdoors.htm, https://www.gardeningknowhow.com/houseplants/hpgen/move-houseplant-outside.htm
I have grown some begonias from corms and they have sent up one shoot, which is now getting long. Should I cut them back to encourage them to bush out or leave them growing as a single stem? I think they may be trailing plants, if there are such things, but not sure. Thank you.
Yes, pinching plants back will normally help them become fuller and encourage a more compact, bushier growth.
I started off my Begonias on March 6th and 13 of the 20 have sprouted with varying degrees of activity! But the remaining seven show no signs of growth. They are all in the same position, on a warm tray of moist compost on a windowsill above a radiator in an upstairs room. The temperature is about 68 degrees Farenheit. None of the tuberous corms has rotted (they were all stored correctly through the winter). I have grown tuberous Begonias many times and never had such a dismal success rate. Any ideas??
Since it can take some time for these plants to sprout, I would give them a little more time. They may simply be slow to start this year. Also, you may want to check the corms to ensure that they are still firm - even if they were beforehand, something could have gone awry and now causing issues.
I recently bought some begonias that were started in a fabric. Should I remove the fabric before planting in my garden?
No, the purpose of those kind of starter bags is that you can put the whole thing into the soil, without disturbing the plant's roots. The bags usually add nutrients, also.
I just purchased a Sophia angel wing begonia. It's quite small and I'd like to set it outdoors till late Sept. Can I put lobelia in the pot with it for the summer or does it like to be alone?
Plants can be put together into containers only when they share the same basic needs -- light, water, and soil. Here are two articles on these plants: https://www.gardeningknowhow.com/ornamental/flowers/begonia/angel-wing-begonia-care.htm
https://www.gardeningknowhow.com/ornamental/flowers/lobelia/lobelia.htm
From these you see that while they like basically the same light, lobelia likes to be kept moist, while begonia needs to dry between waterings. These two would probably not be happy together.