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About Greg Simpson
(Top Expert on this page)

Expertise
I can answer questions regarding planting, transplanting, care, propagating, identification and general information. The questions can be about cacti and other succulents from North and South America and Africa.

Experience
Collecting cactus and succulents since 1974.
   

You are here:  Experts > Science > Botany > Cactus

SubjectDate AskedExpert

mushroom growing w my cactus!8/4/2007Greg Simpson
  Q: I have a cactus that I bought from Walmart a few yrs. ago. It is abt. 7" tall w/ spikes 3/4" long ...
  A: Calista, Typically, mushrooms indicate that there is a lot of water present, but not always. They ...
euphorbia hermentiana cactus8/3/2007Greg Simpson
  Q: My cactus is wilting,turning yellow and rotting in spots. I was wondering what this could be and if ...
  A: Suzanne, I am sorry for the delay in answering you, have had some computer issues that are now ...
Losing a large sahuaro8/2/2007Greg Simpson
  Q: When my wife and I built our new home, 2 years ago, we needed to re-locate 4 sahuaros. 3 fared ...
  A: Walt, I am sorry for the delay in answering you, have had some computer issues that are now ...
Dying Cactus8/2/2007Greg Simpson
  Q: I have a cactus that I keep at my desk at work. It has a green stem with a large orange prickly ...
  A: Kim, I am sorry for the delay in answering you, have had some computer issues that are now ...
black tip on my cactus8/2/2007Greg Simpson
  Q: I got a cactus a couple years ago, and it was doing fine. I'm not sure what kind it is. Recently the ...
  A: April, I am sorry for the delay in answering you, have had some computer issues that are now ...
What kind of cactus is this and what is it doing?8/2/2007Greg Simpson
  Q: I bought a cactus from a Wal-Mart several months ago but the tab that came with it was very vague on ...
  A: Matt, I am sorry for the delay in answering you, have had some computer issues that are now ...
root rot - Aaoe dichotoma8/1/2007Greg Simpson
  Q: I have a 5ft tall aloe dichotoma that started turning light green and the leaves falling and turning ...
  A: Gina, I am sorry for the delay in answering you, have had some computer issues that are now ...
first cactus8/1/2007Greg Simpson
  Q: I just got a new red moon cactus its about 3" and i really dont want it to die. Are there any tips ...
  A: Ian, I am sorry for the delay in answering you, have had some computer issues that are now ...
fallen cacatus plant7/31/2007Greg Simpson
  Q: what can be done to save a 6ft. plant that fell over. it was in a pot at least 2ft. wide.It took 2 ...
  A: Albert I am sorry for the delay in answering you, have had some computer issues that are now ...
cactus7/30/2007Greg Simpson
  Q: my cactus plant tips over. how do I transplant it?
  A: Keith, I am sorry for the delay in answering you, have had some computer issues that are now ...
Organ Pipe Takeover7/29/2007Greg Simpson
  Q: I have an organ pipe cactus (living in the Phoenix, AZ area)taking over my front yard. How can I ...
  A: Ryan, I am sorry for the delay in answering you, have had some computer issues that are now ...
Crown of Thorns Plant care7/29/2007Greg Simpson
  Q: I just bought a Crown of Thorns Plant. I need advice on the care of this plant. I live in Houston ...
  A: Cindy, I am sorry for the delay in answering you, have had some computer issues that are now ...
cactus fall!7/27/2007Greg Simpson
  Q: it had broken inhalf - will it ever grow together again? it is about 17 years old and in a pot. ...
  A: Anne, I am sorry for the delay in answering you, have had some computer issues that are now ...
souvenir saguaro cactus7/26/2007Greg Simpson
  Q: I planted the souvenir saguaro cactus seeds about 4 years ago and now have several little saguaro ...
  A: Marion, Yes you can plant them out, just make you plant them under something, like a small bush. In ...
Cleaning a cactus7/26/2007Greg Simpson
  Q: I've had a cactus for 20 yrs now. I do not know the name/species. It is now 6 feet high. There are ...
  A: Gabi, I am sorry for the delay in answering you, have had some computer issues that are now ...
Aloe Vera changing color7/26/2007Greg Simpson
  Q: I live in Indiana and was given a start off an aloe vera frm a friend who also lives in IN. Her's ...
  A: Kathy, I am sorry for the delay in answering you, have had some computer issues that are now ...
Aloe Vera7/26/2007Greg Simpson
  Q: I have a huge Aloe plant that has just started to flower, Is there anything special I need to do? ...
  A: Mary, I am sorry for the delay in answering you, have had some computer issues that are now ...
cactus7/26/2007Greg Simpson
  Q: Greg, I've had my cactus for about a year, its' 4feet tall, at the tips of the cactus it's light ...
  A: Dragan, I am sorry for the delay in answering you, have had some computer issues that are now ...
babies7/25/2007Greg Simpson
  Q: I have a cactus that has a whole lot of babies on it. Will it be better off and grow better if I was ...
  A: Patti, I am sorry for the delay in answering you, have had some computer issues that are now ...
aloe7/25/2007Greg Simpson
  Q: how can i get a two year old aloe vera to have pups? i have a smaller aloe that has a lot of pups
  A: Shaina, I am sorry for the delay in answering you, have had some computer issues that are now ...
Ever Tall Aloe7/24/2007Greg Simpson
  Q: Greg, I have an Aloe that is ~8 years old. Unfortunately, it was not taken care of for a couple of ...
  A: Nicole, I am sorry for the delay in answering you, have had some computer issues that are now ...
Sick 'wily coyote' cactus7/24/2007Greg Simpson
  Q: I have a classic 'wily coyote' cactus, given to me as a wedding present. He's about 3 feet tall; and ...
  A: Jess, I have never heard of that cactus and depending on what type it is, it could be either a ...
aloe vera7/24/2007Greg Simpson
  Q: I have a small aloe vera plant that I have been growing indoors. Recently we have noticed this ...
  A: Missy, Sounds like mealy bugs to me. As long as their are not too many, the most effective way to ...
cactus apples7/23/2007Greg Simpson
  Q: What do i do after I've picked them? Can I just peel it and eat it? What other ways can I prepare ...
  A: Earl, I have not tried it, however I have heard about how to prepare it. I believe it can be eaten ...
staking a saguaro7/22/2007Greg Simpson
  Q: I have a 10' saguaro that is starting to lean. What can I do to prevent this from continuing. Thank ...
  A: Bill, You can use 2x4's to keep it up straight. Wrap the end of the 2x4 in a piece of old carpet ...
Paddle Cactus Disease7/22/2007Greg Simpson
  Q: Have native paddle cactus in yard. Some have developed white, puffy fungus. Any idea what it is and ...
  A: Bill, You have a Cochineal infestation. Unfortunately that are tough to eradicate. However, natural ...
Baseball plant brown spots7/22/2007Greg Simpson
  Q: What could cause my baseball plant (succulent) to get orange/brown spots? Also, it is growing ...
  A: Judy, Without seeing a picture of the spots, I'm not sure what the problem could be. (you can send ...
cactus rotting at bottom7/21/2007Greg Simpson
  Q: we think it is a euphorbia. It stands about 6ft in height and grows about 6 inches a year. the ...
  A: Remy, Make a cut about 4 to 5 inches above the visible rotted area. Be careful not to get any of ...
What kind of cactus do I have?7/21/2007Greg Simpson
  Q: A couple of months ago, I purchased a cactus from Wal-mart and I do not know which kind of cactus it ...
  A: Michael, You have a "moon cactus", which is normally a Gymnocalycium mihanovichii grafted onto a ...
Repotting a cactus7/20/2007Greg Simpson
  Q: I brought back a round VERY spikey cactus from lanzarote in march, it seems to be potted in lava ...
  A: Sandra, Cactus are very happy being root bound. In nature, many grow in what seems to be pure rock. ...
Totem Pole Cactus replanting an arm7/19/2007Greg Simpson
  Q: First off, I'm a moron, so talk idiot to me. I have a big ol' totem pole cactus which has grown ...
  A: Paul, Is there a way to cut off one of the arms and transplant it elsewhere in the garden? Yes, ...
Aloe Cactus7/18/2007Greg Simpson
  Q: I have a potted aloe plant that I know is at least 3 years old. Generally during the winter I keep ...
  A: Brittany, The only thing that makes sense is that your plant is being sunburned. Plants that ...
moon cactus7/16/2007Greg Simpson
  Q: my moon cactus use to have a beautiful yellow and orange top but it has shriveled up and turned ...
  A: Sheena, Yes, you can cut it off and it shouldn't have any affect on the remaining plant. Nothing ...
cutting out yucca7/16/2007Greg Simpson
  Q: I have a yucca plant that is a big as a tree. It has several trunks from the ground. One section ...
  A: Sandy, Go ahead and cut it off. Just make sure to make the cut so that water can not collect in the ...
Mexican fencepost drooped7/15/2007Greg Simpson
  Q: 2 of my 3' potted Mexican fenceposts drooped over and feel spongy. The one standing is firm. They ...
  A: Michael, It sounds like they may have rotted, either from too much water or from sunburn. Do you ...
eurytoma7/14/2007Greg Simpson
  Q: My dad has an aloe vera farm in Mozambique it has been going for about 3 years now. He has noticed ...
  A: Tarryn, Actually, eurytoma is a parasitic wasp that kills other bugs, not plants. See the link ...
Echinocactus7/12/2007Greg Simpson
  Q: 1) I have a 12 inch Echinocactus that I have just repotted. When should I apply a first watering? ...
  A: Gerald, Water it when the soil is dry. Flowering will depend on the species. The larger species ...
Zones for outdoor planting of aloe vera7/12/2007Greg Simpson
  Q: I have a large aloe vera plant, I think it might be aloe barbadensis, but since someone just gave it ...
  A: Cyndie, Low teens will kill any Aloe. However, if you plant it against a south facing wall and ...
broken catci7/11/2007Greg Simpson
  Q: My very tall cacti plant broke in thirds, is there any way I can save this plant, and what do I need ...
  A: Toni, Let the pieces dry out for at least a couple of weeks. The plant and water only when the soil ...
Outdoor Yucca7/11/2007Greg Simpson
  Q: I have a lonely Yucca that has finished it's bloom this year and now has about 20 large green seed ...
  A: Ron, You need to wait until the seed pods dry and split. After that, go ahead and plant the seeds ...

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