Detailed Explanation of Key Points for Photinia × fraseri Cultivation Techniques

Photinia × fraseri is the collective name for hybrids of the genus Photinia in the Rosaceae family. It is an evergreen small tree, named for its bright red new shoots and young leaves. Two varieties are commonly seen: Red Robin and Red Tip, among which Red Robin has more brilliantly colored foliage and better ornamental value. The leaf color of Photinia × fraseri can change with the age of the leaves. In spring and autumn, the new shoots and young leaves are a fiery red that is bright and long-lasting, full of vitality; in the high-temperature summer season, new leaf emergence decreases and old leaves turn dark green, bringing a fresh and cool feeling amid the scorching summer heat; in winter, leaves that have endured frost and snow take on a brownish-red hue, bringing a touch of warmth to the desolate earth. Photinia × fraseri has strong ecological adaptability, tolerates low temperatures and poor soil, and also has a certain shade tolerance; under direct sunlight, its colors are even more vivid. At present, this emerging colored-leaf tree species is widely favored, with broad market prospects and huge development potential. Its propagation and cultivation techniques are introduced as follows:

Nursery Site Selection and Soil Treatment

The nursery site should be chosen in a wind-sheltered, sunny location with convenient transportation, flat terrain and deep soil. The soil should preferably be loose in texture, fertile, and slightly acidic to neutral, with convenient irrigation and good drainage.

Before planting, apply 3000kg of farmyard manure and 50kg of superphosphate. The soil should be plowed to a depth of more than 25cm, and fungicides and sterilizing agents should be applied at the same time to prevent and control pests and diseases. The beds should be deeply plowed and finely prepared, with grass roots and stones removed. The bed surface should be 90—120cm wide and 20—30cm high, with a path 30cm wide. The length of the seedbed depends on the situation, generally 10—20m. After the seedbed is prepared, to prevent weeds, spray a 500-fold dilution of Goal (oxyfluorfen) before cuttings are inserted.

Cutting Treatment and Insertion

Use semi-lignified softwood shoots or fully lignified current-year branches, cut into one-leaf-one-bud segments about 3—4cm long, with smooth cuts. After cutting, place the cuttings quickly indoors in a ventilated, shady place, spray water promptly to moisten the leaf surface and keep the cuttings fresh, though it is best to insert them as soon as they are cut. Before insertion, treat the cut ends with a rooting agent to speed up rooting and increase the survival rate.

Cuttings can be inserted in early March for spring insertion, early June for summer insertion, and early September for autumn insertion. Insert the treated cuttings into the soil at a row spacing of 4—6cm, with a depth of more than 1/2 of the cutting length. When inserting, the cuttings should be aligned and evenly spaced, with the leaves of each plant parallel, striving for neatness and uniformity to facilitate management, observation and inspection. After insertion is completed, water thoroughly immediately so that the cuttings and soil are closely combined. To prevent damping-off and root rot, a 600-fold dilution of Lüheng No. 2 can be applied to the seedbed together with watering.

Construction of the Plastic Film Shed and Shade Shed

After the cuttings are inserted and watered thoroughly, insert bamboo strips sharpened at both ends in an arch shape (the height from the bed surface to the top of the bamboo arch is about 50cm), cover with agricultural plastic film, and press and seal it tightly with soil, leaving no gaps. After the plastic film shed is sealed, remember that direct sunlight must be avoided; a shade shed should be erected over the plastic film shed immediately, with a height of 1.5—2m, using a shade net with 60-70% light transmittance. The surroundings of the plastic film shed must also be shaded to prevent direct sunlight from the sides.