Agriculture Experts said coriander crop require proper irrigation to increase yield. Excess water damage coriander crop. Experts recommended that after cultivation of coriander dont give water till 15-20 days and when plant reach 4 to 5 inch than start hoeing.It is a cool season crop. Cool weather is favourable for its cultivation. It is susceptible to mild frost.Following are the improved varietis of coriander: Dilpazeer and Qandhari. Dilpazeer is more effective.