A dated, but relevant post on website of the As-Sunnah Foundation of America, an Islamic Sufi organization, shows the following photograph and caption:

HRH Prince Charles was photographed some time ago at
the Grand Opening of a new Ahl as-Sunna masjid in London.
Here accompanied by two shaikhs wearing traditional Sunni
turbans he waters a newly planted-tree symbolizing the
spread of Islam in England.