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In supersymmetry (SUSY) models with low electroweak naturalness (natSUSY),which have been suggested to be the most likely version of SUSY to emerge fromthe string landscape, higgsinos are expected at the few hundred GeV scalewhilst electroweak gauginos inhabit the TeV scale. For TeV-scale heavy neutralSUSY Higgs bosons H and A, as currently required by LHC searches, then thedominant decay modes of H, A are into gaugino plus higgsino provided thesedecays are kinematically open. The light higgsinos decay to soft particles soare largely invisible whilst the gauginos decay to W, Z or h plus missingtransverse energy (MET). Thus, we examine the viability of H,A-> W+MET, Z+METand h+MET signatures at the high luminosity LHC (HL-LHC) in light of largeStandard Model (SM) backgrounds from (mainly) t\bar{t}, VV and Vh production(where V=W, Z). We also examine whether these signal channels can be enhancedover backgrounds by requiring the presence of an additional soft lepton fromthe decays of the light higgsinos. We find significant regions in the vicinityof m_A~ 1-2 TeV of the m_A vs. \tan\beta plane which can be probed at the highluminosity LHC using these dominant signatures by HL-LHC at 5\sigma and at the95% confidence level (CL).

Detecting heavy neutral SUSY Higgs bosons decaying to sparticles at the high-luminosity LHC