Heuchera 'Citronelle' has the H. villosa species (native to the southeastern United States) in its ancestry, making it much more tolerant of heat, humidity and sun than many more commonly grown varieties.
The sun factor
How much sun to give a Heuchera is a question of the climate you live in. Basically, they don't do well in hot temperatures and strong sunlight, so the cooler the region, the more sun they can stand, the hotter the region, the less.
However, there is still a balance to strike as too much shade will decrease the number of flowers, especially in cooler climates.
Despite its increased tolerance for sunny conditions, H. 'Citronelle' is still a Heuchera at the end of the day and still has its limitations on how much sun it can withstand.
Soil
Heucheras grow best in a well-drained, moist soil that contains organic matter and has an alkaline pH. A good layer of mulch is useful to keep the roots covered, but may decrease the pH. You can counteract this by adding chalk at the end of the winter.
Rejeuvenating established plants
Heuchera roots grow very near the surface of the soil, often rising above to become bare and woody after a couple of years. When it gets to this stage the plants should be taken out and, if necessary, the woody parts cut back. They can then be replanted deeper, at the level of the leaves. Application of a good layer of mulch or loam can slow down this 'root rise', but only for one or two extra years.
Weevil
Planted in good soil and with a good position in the garden, Heuchera doesn't experience many pest or disease problems. However, if a plant dies suddenly, and not because the soil has dried out, it probably has root weevil.
To deal with root weevil, dig the plant out and inspect the roots for white, legless larvae. These are the larvae of the beetle called weevil must be removed and killed, and to be on the safe side, you should also dip the roots in a liquid insecticide. Before replanting it is advisable to cut off some leaves as the damaged roots may not be able to supply enough water to the whole plant and it will dry out.
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