Failing to account for dwell time, or how long the potting compound remains at a given temperature, tends to result in overspecifying because most potting compounds, particularly epoxies, can withstand short temperature spikes above their recommended continuous use temperatures.
To take an example, an epoxy potting compound rated for continuous use of 200 C would have no difficulty withstanding a short burst of 250 C during a soldering operation.
You should either repot your aralia into a smaller container or, if you insist on keeping it in the larger pot, replace the existing soil with a lighter, fast-draining mix that is half potting
soil and half topsoil or sand.
Packaged potting mixes may be too rich for the blood of many plants.
Use soil for one third to one half of the volume of your container mix; the larger the container, the higher the proportion of soil you can comfortably use in the potting mix.
For a container that must stay in the sun, make sure the material is deep enough to diffuse the heat instead of transmitting it to the potting
By September or October, when you see new growth emerge from the pot, freshen the soil by replacing just the top inch with new potting
For containers with drainage holes, plant bulbs in any type of commercial potting soil.
If there's resistance, roots have grown into the potting medium and the pots can be removed from the refrigerator (but they can be left in longer if top growth isn't more than an inch).
They should be planted in a 20-inch terra-cotta pot using potting
soil and organic plant food.
It provides plenty of space for potting
and transplanting and a handsome display area for plants near the house.