Rhododendron 'Dr. H.C. Dresselhuys' planting
- From end March to mid May Once
Rhododendron 'Dr. H.C. Dresselhuys' fertilising
- From end March to end August Once
Rhododendron 'Dr. H.C. Dresselhuys' pruning
- From begin April to end May Once
Rhododendron 'Dr. H.C. Dresselhuys' flowering
- From begin April to end May