Shibui
Imperial Masterpiece
White at the base of the needles is just retained sheaths as mentioned. No problem there.
Dehydration does not only come from lack of water. @cmeg1 has mentioned too much water and root rot. One of the results of root rot is lack of effective roots which leads to inability to take up water even though the soil is wet. Inability to take up water results in dehydration of the plant. Definitely check the soil and root condition.
I get yellow foliage and browning needles on trees that have been too long without repotting. Root bound can inhibit penetration of water into the soil and also reduces nutrient uptake. After repot the affected pines return to normal green. Repotting is not detrimental to plants. Fresh soil, fresh nutrients, new roots and increased aeration are good for plants. While I do not repot or root prune unnecessarily I see a sudden surge of growth in the season after repotting. There are a few species that definitely grow better if repotted every year while they are young and growing fast.
Dehydration does not only come from lack of water. @cmeg1 has mentioned too much water and root rot. One of the results of root rot is lack of effective roots which leads to inability to take up water even though the soil is wet. Inability to take up water results in dehydration of the plant. Definitely check the soil and root condition.
I get yellow foliage and browning needles on trees that have been too long without repotting. Root bound can inhibit penetration of water into the soil and also reduces nutrient uptake. After repot the affected pines return to normal green. Repotting is not detrimental to plants. Fresh soil, fresh nutrients, new roots and increased aeration are good for plants. While I do not repot or root prune unnecessarily I see a sudden surge of growth in the season after repotting. There are a few species that definitely grow better if repotted every year while they are young and growing fast.
