If you’re limited on space look for the compact aster varieties with a shorter growth habit.įill your pot or planter with Scotts Osmocote Premium Potting Mix. Planting in potsĪster can be successfully grown in pots with good drainage - choose a pot to suit the mature height and width of your chosen variety. If needed protect young seedlings from snails and slugs with a sprinkle of Defender Snail & Slug Pellets around each plant. ![]() Mulch around new seedlings to suppress weeds and retain moisture. Once your aster seedlings have 2 sets of true leaves and are big enough to handle, they can be separated into individual plants and transplanted in your garden or larger pots to continue growing. Aster seeds will germinate best when the soil temperature is 20-25 degrees Celsius so use a heat mat or glasshouse if needed. Growing from seedĪster seeds are best sown in trays or punnets filled with Scotts Osmocote Seed Raising Mix and transplanted into the garden when they are big enough.įill punnets or trays with seed raising mix sow aster seeds 6mm deep and keep them moist until they germinate in 10-15 days. Always follow the labels direction for spacing aster plants or seedlings as some spread out more than others. Water in well and mulch to suppress weeds and retain moisture. ![]() Plant your aster into the prepared soil and backfill around each. Gently remove the aster seedling or plant from the nursery punnet or pot and tease the roots lightly if they are compact. Prepare the site for planting by mixing Scotts Osmocote Compost Premium Soil Improver through the original soil - using a garden shovel to turn it through the top 10-20cm.
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