I'm having a hard time keeping my anacharis and water wisteria planted in my gravel. Every day and sometimes more than once a day I have to try to get them back into the gravel and I pile some up around it to try to keep it down. Is there a good way to anchor them? Also, is there a good way to stick them into the gravel without reaching my entire arm in? Some kind of tool or something? I'm kind of getting tired of reaching all the way in everytime.