Bob Stewart

@BobStewart723

Retired Extension Horticulturist. Now Enjoy Growing All Types of Plants - Especially the Succulent and Spiny Ones!

Southern Maryland USA
Vrijeme pridruživanja: prosinac 2012.
8.678 fotografija ili videozapisa Fotografije i videozapisi

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  1. prije 4 sata

    More A "stolon" is a modified stem, with nodes and internodes, and can initiate new growth from those nodes. A common plant that produces stolons is the strawberry and the stolons are called "runners".

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  2. prije 12 sati

    A magnificent Euphorbia esculenta in habitat in South Africa. A medusa type euphorbia with a large caudex. I don't have Euphorbia esculenta in my collection but photos like this makes me want to get one. 😀 Photo by Jiří Merhaut via

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  3. prije 13 sati

    The state tree of Minnesota is the Red Pine, Pinus resinosa. It was selected by the state legislature in 1953. It is a large needled evergreen, growing 50 to 80 ft (15-25 m) in height. Although sometimes called the Norway pine, it is native to North America.

    2 proslijeđena tweeta 7 korisnika označava da im se sviđa
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  4. prije 13 sati

    My largest Titanopsis calcarea flowering a few weeks ago. Titanopsis calcarea, (known in South Africa as "little tortoise feet", flowers mainly in winter and early spring for me. It seems to like the lower, night winter temperatures it experiences in my over-wintering frames.

    2 proslijeđena tweeta 32 korisnika označavaju da im se sviđa
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  5. prije 13 sati

    Echinocactus horizonthalonius (eagle claw ) growing in Big Bend National Park, southwestern Texas. Hard to determine if this is a two-stemmed single plant, or two separate plants whose seedlings germinated close together. Nice plant either way. 🙂

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  6. prije 13 sati

    "Genotype" is the actual genetic makeup of a plant, which may or may not be visibly expressed. "Phenotype" is the physical appearance (expression) of a plant based on the genotype. (Yes, I'm reviewing heredity and genetics for my upcoming botany talk.)

    2 proslijeđena tweeta 6 korisnika označava da im se sviđa
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  7. 31. sij

    There are some succulents that might be called "Mediterranean" plants because they grow best in the Mediterranean type climate of mild winters and not so hot summers. The Aeoniums are such plants. Shown is Aeonium arboreum 'Zwartkop'

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  8. 31. sij

    The succulent genus Echeveria was first described by Swiss botanist A. P. de Candolle (1778-1841) in 1828 and is named after the 18th-century Mexican painter and botanical artist Anastasio Echeverria. Shown is the Echeveria hybrid 'Alfred'.

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    31. sij

    This is why every fossil collecting guide (and local laws) tells you not to collect on the cliffs of the Calvert Cliffs. The waterline is easier and safer.

    Holy 💩 . This afternoon a cliff collapsed in the spot where I took that picture on Monday. A man was buried by the collapse and later rescued by emergency teams. 😳
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  10. 31. sij

    I have a Basic Botany talk coming up next week. I am reviewing fruits today. A common type of fruit is a berry, a fleshy fruit produced from a single flower containing one ovary. These are berries from the American pokeweed or poke salad plant (Phytolacca americana).

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  11. 31. sij

    My first experience with artificial light gardening was long ago just after graduating from high school. This was the simple set up of a fluorescent light unit to grow a few foliage plants. It made me realize you indeed could grow plants without sunlight. A eureka moment. 😀

    1 reply 16 korisnika označava da im se sviđa
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  12. 31. sij

    Rebutia muscula was one of the earliest I had in my collection; presently I have no rebutias. 🙁 Reoccurring problems with spider mites soured me on the genus some years ago. R. muscula, is now considered a form of Rebutia fiebrigii. Beautiful soft white spines.

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    31. sij

    Giant cypress of Tibet: TOO COOL! More at

    1 reply 2 proslijeđena tweeta 7 korisnika označava da im se sviđa
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  14. proslijedio/la je Tweet
    13. sij

    Succulents covered with paint or glitter might be fun for awhile, but don’t count on them to live very long. These substances interfere with the plants’ ability to receive light for photosynthesis and the plants won’t have the energy they need to survive…

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    29. sij

    Chinese money plant (Pilea peperomioides) is a popular small houseplant that is easy to propagate. When new shoots grow from the main stem or roots and are about 2-3” tall, you can separate them from the parent plant and put them directly into fresh pott…

    2 proslijeđena tweeta 7 korisnika označava da im se sviđa
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  16. 29. sij

    One of my favorite opuntias is Opuntia basilaris, the beavertail cactus. The pads (stems) are spineless and attractive, and the flowers are nice also. Unfortunately, it is not reliably winter hardy here in Maryland, so there will not be one in my outdoor hardy planting. 🙁

    1 reply 8 proslijeđenih tweetova 39 korisnika označava da im se sviđa
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  17. 29. sij

    While I primarily grow cacti and other succulents now, it wasn't always the case. Years ago, my passion was African violets, and I had an entire room dedicated to them and grew them exclusively under fluorescent lighting. They really are great plants, and they have no spines!

    1 reply 5 proslijeđenih tweetova 47 korisnika označava da im se sviđa
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  18. 29. sij

    My outdoor winter hardy C&S beds are primarily for plants that can stay outdoor all year, but sometimes I would add a few non winter hardy plants. One such summer only plant was this large Aloe ferox. People were always surprised to see it planted outside here in Maryland.

    1 reply 3 proslijeđena tweeta 20 korisnika označava da im se sviđa
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    28. sij

    This👇is a great example of the diverse impacts of research. You might be surprised where a career in Plant Pathology can take you!

    From deep within the Soudan iron ore mine in MN comes a fungus that produces antifungal compounds for potential use to control Pseudogymnoascus destructans, the fungus causing white-nose syndrome of bats – our new paper just out:
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  20. 28. sij

    The State Bird of Pennsylvania is the Ruffed Grouse. Actually it was officially adopted by the legislature as the state game bird in 1931. The ruffed grouse was an important part of the food supply for early settlers of the state.

    2 proslijeđena tweeta 2 korisnika označavaju da im se sviđa
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