SORBUS VESTITA

'HIMALAYAN WHITEBEAM'

Rosaceae: A fast-growing, variable tree up to 25m high in the wild but usually to 12m in cultivation, erect when young, later spreading to become broadly conical. Downy white flowers are scented like hawthorn and are in loose corymbs, up to 10cm across, in late spring, and are followed by round or pear-shaped fruits, 2cm across, green speckled and flushed with warm brown, or orange red, ripening in early winter; Sorbus flowers are visited by many insects and their fruits are eaten by many birds. Native to Himalaya, Western China.

Rowan (sorbus sp.)

Germination, Sowing and After Care Information

Rowan seeds have a deep dormancy within them, this requires a degree of patience to overcome, and it is usually quite easy to get high levels of germination if the correct procedures are followed.

First prepare a free draining substrate into which the seeds are to be mixed, this can be a 50/50 mixture of compost and sharp sand, or perlite, vermiculite. The chosen substrate needs to be moist (but not wet), if you can squeeze water out of it with your hand it is too wet, and your seeds may drown and die. Mix the seeds into the substrate, making sure that there is enough volume of material to keep the seeds separated.

Place the seed mixture into a clear plastic bag (freezer bags, especially zip-lock bags are very useful for this -provided a little gap is left in the seal for air exchange) If it is not a zip-lock type bag it needs to be loosely tied. Then write the date on the bag so that you know when the pretreatment was started.

The seeds first require a period of warm pretreatment and need to be kept in temperatures of 20° C (68° F) for a period of around 2 weeks. During this time make sure that the pretreatment medium does not dry out at any stage, or it will be ineffective!

Next the seeds require a long cold period to break the final part of the dormancy, this is achieved by placing the bag in the fridge at (4° C or 39° F) for 30 weeks (although it is possible for germination to begin from the 16th week -so check the seeds every few weeks!). It is quite possible for the seeds to germinate in the bag at these temperatures when they are ready to do so, if they do, just remove them from the bag and carefully plant them up.

When the period of pretreatment has finished the seed should be ready to be planted. Small quantities can be sown in pots or seed trays filled with a good quality compost and cover them with a thin layer of compost no more than 1cm deep. For larger quantities it is easiest to sow the seeds in a well-prepared seedbed outdoors once the warm and cold pretreatments have finished and wait for the seedlings to appear.

It has also been found that fluctuating pretreatment temperatures can give the best germination results and I have myself had excellent results by keeping the mixed seeds in a cold shed through the winter for the cold stage of their pretreatment and allowing the temperature to fluctuate naturally. Ungerminated seeds can have the whole warm and cold process repeated to enable more seeds to germinate. Fresh seedlings can keep germinating for several years after the original sowing date.

All sorbus seeds will germinate poorly if the seedbed temperatures are too high. Try to keep soil temperatures below 15° C by using shading if possible or seeds my go into a secondary dormancy. Keep the seedlings well-watered and weed free.

Growth in the first year is usually between 10 - 50cm depending on the time of germination and cultural techniques and developing seedlings are usually trouble free. Allow them to grow for 1 - 2 years before planting them in a permanent position.

HARVESTED: 2024

APPROX. 20 SEEDS