Question I am hoping to seek some advice. I have grown some sunflowers from seeds since the beginning of this year. They grew rapidly initially but now they seem to have stopped growing at a height of about 45cm and they also look like they are not flowering. I add fertiliser (chicken manure from the nurseries) about once every two weeks. Any idea what could be wrong? - Wu Chun WeiAnswer: From the photos, it appears that the plants look malnourished and the pots are too small. Each pot should hold only one plant. A small pot means that the plants may not have received enough water and space for the roots to grow. Sunflowers require plentiful amounts of direct sunlight and regular fertilising – chicken manure may not be sufficient. You may supplement with inorganic soluble fertiliser or use bone meal instead, although it may smell – use a teaspoon per pot and water immediately. Sunflower roots also need a large space to grow and the soil needs to be kept moist. At the same time, given the amount of space in an apartment, sunflowers propagated in an apartment may not grow as large as those planted in outdoor plots. - Dr Wilson WongAsk the Expert team is made up of NParks horticultural and gardening experts. If you have any questions on plants or plant-related subjects, please send your question to Ask the Experts at nparks_communications@nparks.gov.sg