Summer grub for your citrus tree we recommend using summer citrus feed during the warmer months to ensure your citrus trees grow and maintain a strong crop of fruit year round buy summer citrus feed today from tree2mydoor uk using summer citrus feed helps to maintain steady growth during spring and summer months summer citrus feed will help to promote leaf growth and general vigour and discourages premature ripening fruit drop and leaf discolouration our citrus feed is a nitro