низя писал(а): а литопсы легко зацветают? Из кактусов, знаю, с рипсалидопсисами бывают проблемы в домашних условиях.
Личного опыта с цветением литопсов, к сожалению, пока нету, надеюсь, скоро будет. Только начитка - зацветают на третий-четвертый год после определенного количества "линек" (от "линять") после экстремальных издевательств с сухим холодным "зимним" (по южно-африканскому) содержанием.
Предполагаю, что информация ниже Вам отлично знакома, но все же...
Покопавшись в зарубежном интернете, ботаники и цветоводы сходятся к рекомендациям для стимуляции цветения: приблизить условия содержания крассул к родным (яркое прямое освещение, зимние по-африканскому сезону температуры, теплые - африканской зимой, скудный полив африканской зимой, бедные азотом грунты, имитацию короткого светового дня в африканскую весну) - в целом, создать искусственный стрес рестению, близкий к его гибели, что заставит его продолжить жизнь через цветение и семена.
Вообще, чаще всего пишут о соблюдении фотопериодизма, искусственном поддержании необходимой короткой длины светового дня.
Спойлеры не работают, потому будет простыня текста:
Ron Smith, Horticulturist, NDSU Extension Service
https://www.ext.nodak.edu/extnews/horti ... ntents.htm
1. Q: My wife and I inherited an old jade plant from her grandparents. We set the plant outside, but moved the plant inside before winter. We placed it next to a window where it receives approximately six hours of sun a day. Within the last month or so, we've noticed blooms. Is this a sign of a healthy plant or have we shocked the thing into propagation? We've seen no signs of insects or mold, but a few leaves turned brown and dropped from their stems. A landscape architect friend of mine estimated the plant's age at 40 years or more and described it as a "living heirloom." Is this an accurate description? How old do these things get? I appreciate your time and thoughts!
1. A: A flowering cycle is rare with the jade as a houseplant. It simply means that it has accumulated enough carbohydrates, along with the good care you've give it, to go into a reproductive cycle. Yes, the plant is a genuine "living heirloom" as your landscape architect friend said. Anything that is passed from one generation to another fits that definition. You might want to take some cuttings from it to pass on to your relatives to create an "extended family."
2. Q: I have had a jade plant since I was 16 years old. I am now 41. The plant is huge and beautiful. About seven years ago, much to my surprise, it bloomed. It was more white than green! I have been unable to produce any blooms since. I had another jade plant in the house at the time. Did one pollinating the other cause my original plant to bloom? Is there any product to buy that will pollinate the plant into bloom? A friend told me only female plants will bloom. I thought at the time this was ridiculous, but since no blooms have appeared since, I am beginning to wonder about this possibility. Is there anything I can do to produce blooming again, such as placing the plant in darkness for awhile?
2. A: The only thing that will make the jade flower again is brighter indirect light, festooned with some direct sunshine through a sheer curtain. That along with the fantastic care you have been giving it all these years should get it in flower again in nine to12 months.
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Вопрос:YOU ASKED THE MAD GARDENER. . .
I left my two large jades outside as long as I could this fall--until temps were down in the 30's at night. I think at least one of them is starting to show signs of having set some buds. I've read different explanations of what it takes to get them to flower, such as exposing them to low temps for a certain period in the fall, keeping them very dry in the fall, and keeping them in absolute darkness for 12 hours a night for how long I don't know. First, what is your opinion on what gets them to flower, and second, if it is keeping them dry, is it safe to water them now that they are indoors and not being exposed to really low temps, or will I ruin any chance of flowers?
Thanks! Pam
Ответ:Hi Pam,
From what I've learned and after a little investigation, jade plant flowering is mostly prompted by day length--or actually lack thereof (photoperiodism). As the days shorten, many plants (including poinsettias and mums) will go into bloom naturally.
If you've ever visited California, the Southwest or Texas, where jade plants are grown as in ground shrubs, you'll find them in full bloom from late fall until early spring when the nighttimes are at their longest. Given that fact, stress also sends plants into bloom. Essentially they're wanting to reproduce before they die.
Therefore, keeping a plant overly dry might stimulate flowering, regardless of its normal bloom time. Jade plants are succulents and do best when kept cool and very dry during the winter months (and in bright light). When watering, water thoroughly and allow them to become bone dry between waterings.
You'll probably only need to water your jades once per month during the dead of winter. As the days lengthen and the plant starts putting on new growth in late February, you can begin increasing the watering. As you've seen, jades love to be outside during the summer months and will grow very quickly. It's good to move them slowly into full sun as not to burn the leaves.
Note:
I'm not sure about jades, but blooming of many short day bloomers can be affected by too much artificial light in our homes by inadvertently keeping the days too long.
Maybe experiment and keep one in a room where you have lights on in the evening, and the other in a room that, for the most part, only receives natural daylight.
I hope I was of some help and let me know how they do!
Thanks again,
The Mad Gardener
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http://www.new-mexico.cactus-society.or ... Plants.pdf
One more thing.
As your plant grows, you'll have to put it into bigger pots (remember to always add drainy soil). The best time to do this is when the plant is vigorously growing in midsummer. Don't use too big of a pot. A big pot retards flowering, I think. Remember, flowering can be a stress response -- the plant thinks it's going to die so it flowers to reproduce! My three-foot jades are in one gallon (4 liter) pots.
No kidding. It may look ridiculous to have a 3.5-inch (9 cm) trunk coming out of such a relatively small pot, but otherwise the plant gets too big. I recently had a surprise in regard to this matter of pot size and flowering.
A friend took a piece off a jade and placed it into a small ornamental pot, outside, on the patio in full sun. After two years of growth (dormant in the winter) the plant is about 10 inches (25 cm) tall, with a trunk diameter of less than an inch (about 2cm). There are eight apical tips and all eight are setting buds and they will bloom soon. So don't make your plants too happy!
And another thing, if you put the plant against a south wall, that is, it gets no exposure to the north sky, the plant will naturally grow very much toward the sun. To prevent unbalanced growth, and a tippy plant, rotate the plant every few days. Don't wait too long between rotations. You can actually kill a plant that's grown facing one way for three months if you suddenly turn it around.
The function of the north sky, believe it or not, is to make plants generally grow straight up-and-down. If a plant can’t see the north sky, it grows at an angle toward the sun. If you can give it uniform light, that is, in the open not against a wall, wonderful.
Don’t rotate the plant. But, always grow the plant with the same side toward south; mark the pot.
Шлюмбергеры можно заставить цвести при низких температурах длительной, до 2-4 недель, сушкой. Свет нужен очень рассеянный и неважна длина его воздействия. Не знаю, на ярком свету могут ли они зацвести при низких температурах. Шлюмбергеры и толстянки считаются растениями короткого дня по цветению. Но на моих 
с о-очень скромными запросами. С китайскими продавцами боюсь связываться, у них знаний нет. По незнанию могут толкнуть мне совсем не то, что мне надо. Им учиться и учиться, как я поняла после общения с Владимиром Ли.
