A member (breeder) can change the description of their own roses, or the roses of someone they are acting on behalf of as agreed upon. Administrators, a limited few, can change any aspect of a rose listing, as well as most others.

The second part of your query is a little more involved; please bear with me.You have probably/hopefully noticed searching for roses with one or more specific characteristics is very fast, usually seconds. As with any large scale computer database, as is the case with HelpMeFind, this is achieved by defining sets of categories for various rose characteristics. Let use basic color as an example. To generate a list of every red rose, the system software could read the color description of each and every rose to see if the word red is included. This would be a rather slow process given the number of roses the HMF's database contains. If we instead keep list of red roses and another of whites roses, etc. (a gross oversimplification), the process of listing the red ones is much, much faster, and more efficient too. The problem is you can't (efficiently) have different lists for all the possible color variations; you need to make some "generalizations". HMF is much more fine grained then say the ARS color classifications but there are practical limits governed by desired system efficiency and the resources at play. Hence the lack of categories for every color variation.

Now the good news. Recognizing the overwhelming importance of accurate and descriptive color representations, HMF includes free form field for describing a rose's color and bloom characteristics in more descriptive/evocative detail. One has the option of categorizing a rose as simply "red and white" for search purposes but describing it in nuanced detail in the color/bloom description. We try to include that level of detail when it's available. Sadly, it's often not.

Bravo for reading this far! The short answer is... yes we can update description to include more detail.