Design:

http://www.schoolplaygrounddesigners.co.uk/Sensory-Gardens.html

http://paxchristi.org.uk/wp/wp-content/uploads/2013/05/Create-a-Peace-Garden.pdf

Choosing plants:

https://www.rhs.org.uk/advice/profile?pid=524     harmful plants

http://www.crocus.co.uk/designing-with-plants/   

https://www.rhs.org.uk/plants/search-form

Using the school garden:

http://www.ltl.org.uk/

http://creativestarlearning.co.uk/developing-school-grounds-outdoor-spaces

http://www.thekidsgarden.co.uk/AtSchoolCategory.html

https://schoolgardening.rhs.org.uk/home