Question:
I have a pretty Nishiki Willow which has been getting thinner each year in spite of clipping it back in summer. I have taken out several dead branches and given it 20-20-20 fertilizer in water. Are fertilizer spikes any good for this type of tree? Also could snails on the tree be doing it harm?"
Pat Pryce, Maple Ridge
Answer:
The Nishiki willow isn't always easy to grow well.
It hates hot summers, dryness and clay - especially compacted clay. In summer droughts it needs lots of water but this should move freely through. That's why soil it's happiest in well drained situations.
In poorly drained soil, some of the roots may rot and the fact you have some dead branches is a clue that your tree may have some root rot already.
I wonder if you have a spot in your garden which has richer soil, less clay and is somewhat raised so drainage is better.
Otherwise, just go on with what you're doing but try mulching your tree with Sea Soil or weed-free compost.
The 20-20-20 fertilizer you're using will do nicely and several applications through summer should keep your tree nourished.
The clipping should be helping but if new shoots are sparse or dying back in winter, you might try clipping and removing onethird of old wood in the dormant season.
All willows are very easy from cuttings, though with the Nishiki Willow cuttings will produce a bush, not a tree since most Nishiki Willows from garden centres have been grafted onto a trunk. The Nishiki willows I've seen grown from cuttings are low bushy shrubs, but still glorious.
So if your willow shows signs of dwindling away regardless of what you do, you can propagate it from cuttings and enjoy it as a bush. I should add that the Nishiki Willow has a few other names including: 'Hakuro-Nishiki', 'Dappled Japanese Willow,' 'Variegated Willow' or 'Fuji Nishiki.'
Question:
"Where can I buy astrantia plants. Where do they like to be planted. How tall do they get - and so on?"
Ivy Rodgers, E-mail
Answer:
The height of astrantia depends on the species.
The tallest flower heads of Astrantia major grow about 2' (60cm) high while Astrantia minor is the smallest at 8 or 9" (20 to 25cm). The foliage of both species is a low mound of leaves.
This can vary. Astrantia becomes taller or shorter depending on how rich and moist the soil is. It prefers semi-shade, but tolerates full sun if there's moisture in the soil.
Most garden centres have some varieties of Astrantia major. Flower colours vary from white and green, to white and pink to deep reds and rosy pinks.
Anne Marrison is happy to answer questions. Send them to her via amarrison@ shaw.ca
