How to Graft Azaleas? A Detailed Guide to Azalea Grafting Methods

Azaleas play an important role in enhancing the home environment: on the one hand they bring visual enjoyment, and on the other they can freshen the air. Below we will discuss azalea grafting methods, as well as azalea care.

I. Azalea Grafting Methods

1) Head removal cleft grafting. When the scion wood branch has only a few whorls of leaves at the very top and no leaves in the middle and lower parts, this grafting method should be used. First cut off the leafy shoot tip, then make a downward slit 0.6 cm deep in the center of the cut. The scion should be taken from a shoot tip with terminal leaves; cut its base into a 0.5 cm long duck-bill shape, insert it into the cleft in the rootstock, align the cambium on one side, and then tie it.

2) Head-retained side grafting. If the rootstock branch has leaves not only around the growing point but also in the middle and lower parts, this method should be used for grafting. When grafting, do not cut back the rootstock; instead, make an oblique downward cut 0.5 cm long in its middle, with a depth not exceeding 1/2 of the branch diameter, and insert the duck-bill-shaped cut surface at the base of the scion and tie it.

Azaleas are evergreen flowering shrubs, and the scions are tender and bear leaves, so after grafting they must be covered with plastic film for protection to prevent the leaves from wilting. The temperature under the cover must not exceed 30°C, and the humidity should be kept above 80%. Keep them shaded during care. After 20 days most will have healed, and after 30 days the film can be removed.

II. Notes on Azalea Cultivation

1. After azaleas finish flowering, the faded flowers must be cut off to avoid seed production consuming nutrients. After new branches sprout, thin the branches appropriately, deciding which to keep or remove according to the plant's growth vigor.

2. Potted azaleas are generally placed on a southeast-facing balcony, and the spot must be well ventilated; move them as little as possible. Without ventilation, they are prone to black spot disease and massive leaf drop.

3. Thin buds and leaves in time, removing part of the overly numerous and dense buds and leaves so that air circulates and nutrients are concentrated in the flower buds. After the flower buds form, increase nutrition and apply a suitable extra amount of phosphorus and potassium fertilizer; otherwise the flower buds will turn into leaf buds.

4. In summer, too-strong direct sunlight, freezing injury from severe cold, too much watering, too-concentrated fertilizer, being kept indoors too long, being placed in a poorly ventilated or dark and damp place, or being exposed to acid rain may cause azaleas to drop leaves or fail to bloom.

5. Repotting and changing the soil does not need to be done every year; generally once every 2 to 3 years. Damage as few roots as possible, and do it after flowering or in autumn, while also spraying thiophanate to prevent disease.

III. Tips for Growing Azaleas

For potted azaleas, suitable varieties include Sihai Bo, Han Mudan, Wangguan, Wubaozhu, and Taoxue (also called Helan). Choose robust seedlings propagated by cuttings or air layering, and clay pots are preferable. For the potting soil, use humus soil from under coniferous trees, mix it evenly with a small amount of garden soil and sand, and add bone meal; or mix 4 parts broadleaf-tree humus soil, 4 parts decomposed manure, and 2 parts sand evenly, add an appropriate amount of sulfur powder to make the soil acidic, and apply base fertilizer. The pot size should match the plant size; too large a pot easily causes the soil to be too wet and roots to rot. Place tile pieces at the bottom of the pot to aid drainage. When potting, firm the soil around the seedlings, then water thoroughly by the soaking method. During the growing period, keep the potting soil moist at all times. If using tap water, it is best to store it in a vat for 1 to 2 days and place it in a ventilated, shaded spot. After 10 to 12 days, place it on a ventilated, semi-shaded balcony.

In autumn, apply phosphorus and potassium fertilizer frequently (once a week), and water once with clear water the next day after fertilizing. Stop fertilizing in winter and during the plum rain season. For 1- to 2-year-old seedlings, apply little or no fertilizer, otherwise "fertilizer burn" is likely. Shape and prune in good time. After autumn, plants generally bear 1 to 4 flower buds at the top, and before flowering the buds must be thinned: for a branch tip with buds, keep only 1 and remove the rest.

The above are the azalea grafting methods, notes on azalea cultivation, and growing tips introduced in this article. We hope this helps you understand azalea cultivation, propagation, and the points to note during the growing process, so you can grow a thriving pot of azaleas yourself.