But I knew nothing about him.

今年7月24日 is which year?

树葬 is good. We chose 树葬 for my father too.
Here is a famous poem for them.
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Trees (by Joyce Kilmer)

I think that I shall never see
A poem lovely as a tree.
A tree whose hungry mouth is prest
Against the sweet earth's flowing breast;
A tree that looks at God all day,
And lifts her leafy arms to pray;
A tree that may in summer wear
A nest of robins in her hair;
Upon whose bosom snow has lain;
Who intimately lives with rain.
Poems are made by fools like me,
But only God can make a tree.

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Think "God" as nuture here. :-)