Mild Boron deficiency may not be obvious
from the foliage but flowers can be affected - petals become quilled
and do not develop their normal form, they may also bruise easily.
Severe Boron deficiency may cause
leaves to become brittle and closely spaced. The tips of middle/ upper
leaves may curl upwards and become pale green, yellow or white with a
purple tint at the margin.
1. it is very difficult to remove excess boron during the growing
phase, flooding the soil or compost may help.
2. Boron deficiency can be addressed
by the use of borax dissolved in water.