Lettuce seeds : Butterhead : Tom Thumb Ref: TM01400467 SowingSow thinly from March to late April 6mm (¼in) deep in drills 15cm (6in) apart. A moist, well drained, fertile soil which has had plenty of compost dug in the previous autumn is best.GrowingAs soon as the seedlings are large enough to handle, thin out gradually to 15cm (6in.) apart.Aftercare To test whether the heads are ready to harvest, press them gently with the back of the hand, they will feel solid and barely yield to pressure.Floweringcropping65 DaysPlant typeVegetable Price: £1.29 Quantity: