Eighteen people participated in the official tweet up, according to Obama Foodorama. They were invited into the White House to prepare a healthy meal.

The White House streamed the event on its website, where Obama was seen working in the garden and joking with the kids.

The campaign's Twitter page re-tweeted one participant's description of a moment between Obama and one of the children helping out with the harvest:

The Democrats also promoted the hashtag #AskMichelle as a way to ask the First Lady questions about the campaign.

Michelle ObamaMichelle ObamaTrump gets royal welcome during 'tremendous' Saudi Arabia visit Melania and Ivanka Trump choose not to wear headscarves on Saudi trip Robin Wright: 'Trump has stolen all of our ideas' for 'House of Cards' MORE does not have her own Twitter page.