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SO Gardening — Nov 18

Sunday, November 18, 2018

Dear Orchid Doc:

I have had a few cymbidiums for a long time now but they won't bloom. What advice can you give me to help the situation? They look quite healthy otherwise, and extremely fat with multiple bulbs.

 

Tanesha

 

Dear Tanesha:

The fact that your plants look quite healthy and have multiple shoots would suggest that you have the growing and fertilising aspect of it down pat.

However, I have to tell you that there are some cymbidiums that refuse to bloom in the warmer climates, though there are some hybrid types that are more tolerant of the heat and will therefore bloom at a temperature of higher than 80 degrees.

The older types require a drop in temperature at nights of about 10 to 15 degrees before a spike will initiate; however, when they bloom they last a very long time. The hybrid types are usually very short.

So it might be a good idea to send the plants up to the cooler areas for at least 30 days during the blooming season, to initiate the buds. Best of luck.

Dear Orchid Doc:

When my orchids' roots are dry, especially the ones in stones, is there anything I can do to revive them or to jump-start new roots?

 

Michael

 

Dear Michael:

Use a bypass pruner to cut the roots at the end of the green part, where the dry part begins.

Bypass pruners have two blades “passing by” each other to make the cut. At least one of the blades will be curved: a convex upper blade with either a concave or straight lower one.

Water and fertilise as usual.

This will encourage new growth.

 

Dear Orchid Doc:

My dendrobiums refuse to bloom. I have had them for a long time and just cannot understand why they are not blooming. I fertilise and spray them regularly. Help!

 

Anthony

 

Dear Anthony:

I cannot tell you the reason, as I am not sure, but I know for sure the dendrobiums will not bloom if they are sprayed with Champion or Kocide.

One common active ingredient is copper, and apart from burning in the sun, the dendrobiums do not bloom once they have been sprayed with either of these two chemicals.

Maybe you have been using one of these?