Grafted rose seedlings: plant with soil mounded no higher than the graft union, blooms bigger than a fist

Many rose growers' purchased roses are grafted onto rootstock of wild rose (Rosa multiflora). These rose seedlings have advantages over ordinary rose seedlings in both growth and flowering, but one thing growers should note is that when planting this kind of grafted rose seedling, the soil must not be mounded "over the top."
Did you know, fellow gardeners? Rose planting is divided into "cutting seedlings" and "grafted seedlings." A cutting inserted directly into the medium is a "cutting seedling"; a cutting or bud grafted onto wild rose is a "grafted seedling." Grafted seedlings can leverage the "strong" constitution of the wild rose, growing several times faster than cutting seedlings, and can grow into a large plant in 2-3 years.
However, what growers need to note is that when planting grafted rose seedlings, the soil must not cover above the graft union. Then in routine care, use a special organic nutrient solution for roses, diluted 500 times, watered once a week, and the nutrients will be supplied entirely to the branches without any dispersion. This way the branches can extend well, the plant will grow into a large specimen, and it will flower well, easily producing large blooms.
When planting grafted rose seedlings, mounding the soil no higher than the top - that is, not covering above the graft union - is a method that can 100% bring out the characteristics of the wild rose. Through this form of not "deep planting," the roses grown this way can spread their roots evenly. Although fewer new branches grow, through regular pruning and care, each branch is very thick and sturdy, and the blooms are relatively large.
When planting grafted rose seedlings, if the soil is mounded above the base in "deep planting," the branches buried in the soil will grow roots. This way the wild rose's roots will lack oxygen and gradually lose their growth momentum. At this point, the rose plant will be like a mini rose from a grafted seedling - although many new branches grow from the ground, the branches are soft and thin, the plant is short and compact, and the flowers will also bloom very small.
So when planting this kind of grafted rose seedling, growers should keep one thing firmly in mind: when planting, do not let the soil go "over the top," and the rose can leverage the vigor of the wild rose to grow and bloom vigorously.
Image from fellow gardener: DoNotMakeMeSad