Secrets of flowering of Jasmine Sambac

Q: Q: My Jasmine sambac Maid of Orleans is growing very fast and produced lots of branches and dark green leaves, when will I see flowers? I only saw 2 or 3 flowers since since Spring. I is planted by East wall of the house. Should I use some special fertilizer perhaps?

A: Jasmine sambac is a tropical bush or vine that enjoys hot summers. Since it tolerates wide range of light conditions, it can be grown both in shade or sun; this is why it is highly recommended for indoor culture where light level is limited. Remember though that profuse blooming directly depends on the light level. Your Eastern exposure location may not be providing enough light for the flowering. Dark green leaves are also a sign of a filtered light sitution. Extra fertilizing may not help to induce flowering if the light is low, although it is always beneficial for a plant (it may just start producing even more leaves and branches). The ideal conditions for Sambac's flowering are - full sun all day long, high temperatures (upper 80's-90's, even over 100F is fine), and very good drainage. Some gardeners call Jasmine sambac "almost a succulent", referring to its low watering needs. To be exact, this plant requires regular watering, but will produce lots of flowers only providing perfect drainage. You may never see flowers if the plant has wet feet or water-logging occurs. If your summers are rainy (like in Florida), make sure your jasmine is planted with at least 4-5"elevation and not in a low/wet spot.

See Top Tropicals Video about jasmine Sambac: - varieties, history and use.

Desert rose winter care

Q: I purchased several packets of desert rose seeds last year. I now have 45 very healthy seedlings some of them in bud. Almost all of my seeds grew but I lost most of them when I rook them in during winter. I did not water them for a month , kept them in their pots and set them by the window. they either dried up and died or rotted and died. I noticed when you send me grafted specimens that you bareroot them. Is this a better way to keep them inside in winter, bareroot? I hate to lose these plants come winter time. Pls advise me. I live in Houston, Tx. where we get temps below 40 degrees and sometime a day or more of freezing temps.

A: Thank you for your question. Rot is pretty common problem with Desert Roses. We monitor our Adeniums closely and have a special set up of watering environment and schedule, in dedicated greenhouses just for them. Nevertheless - every now and then we see a rotten caudex and can't help it to say "oops! over-watered!" These plants are very sensitive to environment changes, especially when it comes to a combination of water and temperature. These are a few tips that should help you to reduce risk of plant loss to a minimum:

1) Use only well drained mix with much higher content of perlite than you would use for most tropical plants. For adeniums, we use mix with 30-40% of perlite in it, while regular mix has 10-15%.

2) Adeniums like alkaline soil, unlike most of tropical plants (hard to say what else likes alkaline... Ficus for sure!). This means, regular mix with high content of peat moss may cause root rot. To increase alkalinity, you may add dolomite. Here in Florida where we have natural supply of shell rock handy, it is easy to add some shell to a potting mix (shell sand, rather than quartz sand). We always add a few large shells on top of a pots with a big specimen. Besides increasing soil pH (making it more alkaline), shells look very decorative.

3) Water very carefully during cooler months. When it is hot (85-100F), excessive water usually won't harm adeniums: it will be partially used by a plant, and partially will evaporate. Especially be careful with water when temperatures drop below 65F - then tropical plants simply stop growing process and go dormant. Once adeniums start losing leaves, this is a sign to reduce watering to once a week to once a month, and in very small quantity (couple tablespoons per pot).

4) We do not bareroot adeniums for winter storage. They are not bulbs. Barerooting of this plant is recommended only during shipping. Adeniums can stay without soil for up to a week without hardly any stress, sometimes even longer.

5) We keep our big collection specimens on a roofed porch during winter, where level of light is very low. Last winter we haven't lost a single plant due to low light. They take shade pretty well considering minimum or no water. However bright light is always better - it creates healthier environment for a plant. We all know about space limitations for our large collections, especially in winter. So if you can afford a bright spot for adenium during winter - the plant will be lucky!