Soil & potting mix

Best soil for Aromatic Aster 'Raydon's Favorite' (Symphyotrichum oblongifolium)

Also called Aromatic Aster, Fall Aster, Wild Blue Aster.

More about aromatic aster 'raydon's favorite'

Aromatic Aster 'Raydon's Favorite' soil at a glance

Best mix	Free-draining, lean, well-drained loam to sandy loam
Light	Direct sun (at least 4-6 hours)
Ideal temperature	-30-35°C (-22-95°F)
Watering	When the top 4-5 cm of soil is dry, roughly every 10-14 days once established

About Aromatic Aster 'Raydon's Favorite'

Symphyotrichum oblongifolium · also called Aromatic Aster, Fall Aster · flowering

A tough, fragrant native aster from the central and eastern US prairies, producing masses of violet-blue daisies in autumn on strongly aromatic foliage. 'Raydon's Favorite' is notably drought-tolerant and mildew-resistant, making it far easier to grow than novi-belgii cultivars. Mildly toxic to dogs and cats.

Preferred mix: Free-draining, lean, well-drained loam to sandy loam

Watch for — Flopping in rich soil: Excess fertility causes lanky, sprawling stems; grow in lean, free-draining soil and avoid high-nitrogen feeds.

Why aromatic aster 'raydon's favorite' needs this mix

Aromatic Aster 'Raydon's Favorite' flowers hardest in a rich but free-draining loam — fed enough to fuel the display, open enough that the roots never waterlog.

Flowering is expensive for aromatic aster 'raydon's favorite': producing buds, blooms and seed draws heavily on nutrients and steady moisture, so the soil has to keep delivering all season.
A loam-based mix holds nutrients and water far more evenly than a light peat mix, which means a longer, more reliable flowering period.
It still needs sharp drainage — most flowering plants resent cold, wet feet far more than they resent being a little lean.

For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.

What goes wrong with the wrong mix

The wrong soil is one of the most common reasons aromatic aster 'raydon's favorite' struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:

A thin, hungry or sandy mix gives aromatic aster 'raydon's favorite' weak growth and few, short-lived flowers — it simply runs out of fuel.
A heavy, badly drained soil rots the roots or crown, often over a wet winter, and you lose the plant before it ever flowers again.
Over-rich, high-nitrogen mixes can push lush leaf at the expense of flowers — balance, not excess, is the aim.

Either starving aromatic aster 'raydon's favorite' in a thin mix or drowning it in a heavy, badly drained one. It wants the rich-but-free-draining middle, plus a flowering (higher-potassium) feed in season.

pH — does it matter for aromatic aster 'raydon's favorite'?

Most flowering plants, including aromatic aster 'raydon's favorite', do well around pH 6.0-7.0. A cheap soil test is worth it outdoors; one notable exception is any acid-lover (such as some hydrangeas), where pH directly changes flower colour.

If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.

DIY mix vs a bagged one

A quality bagged compost works for aromatic aster 'raydon's favorite' in pots if you add grit and a flowering feed. In beds, improving the existing soil with compost and ensuring drainage beats any bag.

Drainage and the pot

Free drainage protects the roots and especially the crown over winter — raised beds, grit in the planting hole and never a waterlogged spot. Containers must have a clear drainage hole.

For perennials, refresh the top layer and feed each spring rather than disturbing the roots; for container displays, start with fresh rich mix each season. When the time comes, our repotting guide for aromatic aster 'raydon's favorite' covers the timing and technique step by step.

Aromatic Aster 'Raydon's Favorite' soil — frequently asked questions

What is the best soil mix for aromatic aster 'raydon's favorite'?

3 parts good loam or quality peat-free compost : 1 part well-rotted compost or leaf mould : 1 part grit or perlite. Flowering is expensive for aromatic aster 'raydon's favorite': producing buds, blooms and seed draws heavily on nutrients and steady moisture, so the soil has to keep delivering all season.

Can I use normal potting soil for aromatic aster 'raydon's favorite'?

A thin, hungry or sandy mix gives aromatic aster 'raydon's favorite' weak growth and few, short-lived flowers — it simply runs out of fuel. A quality bagged compost works for aromatic aster 'raydon's favorite' in pots if you add grit and a flowering feed. In beds, improving the existing soil with compost and ensuring drainage beats any bag.

Does aromatic aster 'raydon's favorite' need a special pH?

Should I buy a bagged mix or make my own for aromatic aster 'raydon's favorite'?

How often should I refresh the soil for aromatic aster 'raydon's favorite'?

For perennials, refresh the top layer and feed each spring rather than disturbing the roots; for container displays, start with fresh rich mix each season. Free drainage protects the roots and especially the crown over winter — raised beds, grit in the planting hole and never a waterlogged spot. Containers must have a clear drainage hole.