I planted two container grow silver birches (a multi-stem, 15 ft or so B
Pendula and a 6ft or so Snow Queen) last September.

Both a currently dormant (as are all the many many birches in the area,
St Albans) but I assume they will start moving in the not too distant
future.

I note that it seems to have been dry in the first quarter of the year.
My garden is less of a bog than it usually is around now. The soil is
stoney clay glacial outwash. We are getting mild nightly frosts at the
moment.

I read words to the effect of 'water thoroughly once a week in the first
growing season' in various sources.

So:

1) How much is thoroughly (in minutes with the hosepipe, per week)

2) When do I start doing this?

3) Oh, And when do I hit them with bonemeal?

I'm wary of drowning them because I have no real idea how wet the soil
down below is. But, obviously, I don't want to dessicate 'em!

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