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Throughout the blooming season, it is beneficial to give your dahlias fertiliser. You can choose whichever variety of fertilizer you want but it’s best to have a combination of 8 – 24 – 16. With dahlias, in particular, you want a high amount of phosphorus and potassium. Be sure to follow the labels when applying any fertilizer. We recommend using tomato feed every 2 weeks as this is perfect and helps promote better flower and is often much cheaper than other feeds.