Tammy I have the same problem and I cannot understand the reason why they ignore my pond?
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Actually, the first year I started the pond, starting from april, I had hundreds of visits and millions of eggs laid by the tree frogs and ofcourse the "night chorus".
But since then, this is the 3rd year that they come in april for only a few hours and go away to the neighbors without laying their eggs.
I don't know how is with your pond but with mine, I can see one possible reason??
The first year I had taken my w.lily pots from a warmer part of the country and they had long stalks. The egg chains were always winded around there stalks.
But the following years, due to our climate, in april I have only pilot leaves on the pots and almost no stalks to round the egg chains. May be they do not find a security place to fasten their egg chains?
How about with your pond plants, do they have long stalks in early spring?
I am also suspicious if any snakes in my garden but did not see any till now.
This year I have only one, from an emergency spawn, I believe.