Summary of experience in home cultivation and care of Ranunculus asiaticus
I'd like to share my cultivation experience with Ranunculus asiaticus. It prefers cool conditions, and its roots like moisture but hate waterlogging. During the flowering period, its water demand is rather high; when short of water, the plant easily wilts, especially the flowers. Even if watering restores it, the overall effect is affected, and at the same time the lower old leaves begin to yellow and wither progressively upward.
Generally, potted flowers bought at flower markets are grown in two different substrates. One is grown in ordinary soil; plants grown this way are sturdy overall but their colors are not very bright, and most importantly, the substrate holds little water, so if watering is not timely the plant easily dries out and wilts, and Ranunculus asiaticus leaves are thin and transpire quickly, especially during vigorous growth and flowering. The other is grown in a mixed substrate of peat and perlite; these look bright, and the substrate holds a lot of water, so if you happily water frequently it causes water saturation, and root hypoxia can also cause the plant to wilt.
In addition, plants I grew in peat substrate were prone in the later stage (the tuber formation stage during flowering) to root-knot nematode infection, causing the tubers to rot so they could not be kept for seed. I suggest that with soil substrate you water immediately when you see the plant slightly wilting, while with peat substrate you absolutely must not water unless the plant is dry. There is also the issue of light: Ranunculus likes light, and under insufficient light the plant will also become leggy or wilt and rot at the roots.
There is also the issue of watering practices. Most people working in flower markets may not necessarily understand this: to keep the plants fresh before they are sold, they water heavily, and during this period some potted plants' roots may already have died, with some functions keeping the leaves upright; add to that frequent watering after you bring them home, and wilting and root rot are inevitable. By the way, Ranunculus is very easy to grow.