Hello. This browning can be caused by various climatic, soil and/or care conditions (e.g. frost, sunburn, sudden temperature fluctuations, inadequate humidity), various phytopathogenic agents (possibly fungal or bacterial in nature), but it is not possible to be sure on the basis of the attached photos and the information provided.
For the time being, it is recommended to remove the dry parts with a sharp and disinfected tool (e.g. ) and to carry out a preventive treatment with a fungicide such as , in a dose of 20 g/10 L water. Spray the solution as finely and evenly as possible on the plants.
At the same time, it is recommended to use a natural fertilizer, rich in beneficial microorganisms: , by watering the roots. It improves the quality of the soil, stimulates rooting and increases the resistance of the plants to various stress factors. 2-3 treatments can be carried out, 14 days apart, according to the recommendations on the label.
Foliarly, during the growing season, you may consider using a fertilizer that is specially formulated for the nutritional requirements of conifers, such as , according to the label recommendations.
More information on the care of this species can be found in our articles:Â Cypress, planting guide and care work , Conifer diseases: affected needles, branches and cones.