Yes, Seasol will not significantly affect soil pH, so it is safe to apply to acid loving plants.
PowerFeed is also safe to use on acid loving plants. As a general rule of thumb, apply PowerFeed All Purpose including Natives, but for a more specific formulation try
- PowerFeed PRO SERIES Roses and Flowers (liquid – apply every 2 to 4 weeks)
- PowerFeed with Troforte Rose Food and Soil Improver – including flowering plants (granular – quick and slow release – apply every 6-8 weeks)
- PowerFeed Controlled Release Rose Food and Soil Improver – including flowering plants (premium granular controlled release – apply once every season).