Surprisingly, orchids that don't have pseudobulbs to store water can also survive without roots in the short term. All you need is a small pot. As the plant grows and the root system develops, you may need to transplant the orchid. Transplanting is more to ensure that the medium is of good quality and less to accommodate the plant, which in nature literally grows on the surface of the bark of the host tree.
There are a few ways to save rootless orchids. You can wrap sphagnum moss around them to create a moist environment and release water, or use the proven “sphag and bag” method with sphagnum moss and a plastic bag. The simplest method is through water cultivation, while some even swear that soaking them in tea works. Ants on orchids aren't very common, but when you see a line of ants entering and around orchids, it's a sign that something bigger is happening.
I brought home several dying orchids from the settlement table, eager for them to come back to life. Either way, you'll know it's time to transplant your orchid when its roots are rotting or starting to outgrow the current pot. Therefore, orchids with pseudobulbs can survive longer without roots compared to those without pseudobulbs. After a month, if the orchid has any chance of a new root growing, it should occur within this time period.
They spread rapidly from orchid to orchid, and once you see visible signs, the infestation is already advanced. Orchids have very sensitive roots that are susceptible to damage or rot when exposed to unfavorable conditions. When using Physan 20 on orchids, be sure to dilute it first according to the product instructions. Once you decide to use sphagnum moss as a potting medium for your uprooted orchid, you'll need to find the right type of pot.
Otherwise, the orchids will look better; besides, their leaves are firm and they stopped dropping and neither did other Vandas. The leafless orchid still has a chance of survival, you would simply keep it watered or even put it alone in water. Depending on the problem, the orchid can be saved by replanting, trimming all dead roots, cutting off leaves with spreading bacterial infection, relocating the plant, or stimulating root growth. No orchid parent would want to give up their sick orchid, but not all uprooted orchids can be saved.
Another method is to create a humid environment for your orchid using a moisture tray and a plastic bag. If it's a rootless orchid, you'll have to put more effort into stimulating root growth.