DIFFERENT TYPES OF AGAR Mac Conkeyâs Agar plate MacConkey (also McConkey) agar is a culture medium designed to grow Gram-negative bacteria and stain them for lactose fermentation.he pattern of lactose fermentation and H 2 S production aids in the identification of the organism subbed to the plate. HE agar is designed to isolate and recover fecal bacteria belonging to the Enterobacteriaceae family. HE is particularly useful in isolating Salmonella and Shigella.
In fact, spring should be the only time for complete cutting back. Pruning hibiscus plants entirely helps rejuvenate them for summer blooming. Branch tips can be pinched, or tip pruned, throughout the season, however, to encourage bushier growth.
Tropical hibiscus may begin dropping leaves when the temperature falls to between 40 and 50 degrees F, so owners are warned to bring plants indoors before nighttime temperatures fall below the 50 degree mark.he Chinese hibiscus (Hibiscus rosa-sinensis) is the tropical hibiscus widely available in garden centers each spring and is hardy from USDA zone 9 to 11.